Firstly, it's worth noting that everyone from the main cast is confident that they'll be the winners this time... Yamcha and Kuririn are even overconfident in the Airplane, not even remembering Goku or Jackie Chun and treating each other as bigger deals. Bulma or Oolong both try to remember them about those contenders, but they seem to pay no attention. They are in their little world and only thinking in themselves. I agree that it's somewhat strange how the power that once was treated like a God, Goku from Uranai Baba, not being so relevant to the big guys anymore (Yamcha, Kuririn and etc.) and how that power, as well as Son Gohan's seem to be already old news, but that's kind of a common theme in Dragon Ball. As similar examples, we can cite Trunks as a SSJ being introducced as a rather big deal, easily killing Freeza, the former super villain, and quickly being diregarded before the new threats (the androids)... or how Raditz's power, that seemed to be in a different level compared to everything we have seen before is also quickly disregarded once we get to know about the two Saiyajins way stronger than him. That's kind of a common theme in Dragon Ball. So, we get everyone being confident that their power is high enough that even Goku's former power will pose no challenge:
They seem somewhat interested and worried about Goku's progress, specially after seeing how Goku came swimming from the opposite side of the Earth, but they still seem pretty confident in their chances. It's fine to see that they still seem sweating at the prospect of Goku getting stronger, but what seem to worry them the most is the unknown power that Goku might have... the power he had at the Uranain Baba Tournament is something they can handle, otherwise they wouldn't even consider the prospect of winning the Tournament. That statement came right after seeing how Goku put his body through an extreme effort through swimming from a different country until there, which obviously implies Goku was no merely joking those past three years, although Goku's psyque as well as the way he acts make it sound like he hasn't progressed that much or hasn't even progressed, which goes back to what Kuririn stated before:
Goku looks soft in the outside, but is still a monster in the inside. It seems the thought of Goku getting stronger seems to scare them a bit, but mainly because they can't know how much stronger he got... it's still kind of a mystery.
Jackie Chun is also pretty confident about the champion title belonging to him once again, which shows he also surpassed Goku's old power, but like the others he still seems somewhat worried about Goku's progress:
So, at the first chain, we'd have:
Jackie Chun, Yamcha and Kuririn >> Son Goku [Uranai Baba Tournament]
Even so, they still seem somewhat worried about Goku's progress.
Yamcha fights first, defeats some random guy with one punch, then Kuririn defeats some giant-sized man in an also very convincing fashion, throwing him out of bounds. And then, it's Goku's turn, and it's against King-Chappa/Chappa-o. Everyone thinks Goku has found himself in a sticky match from the beginning, and that they'll finally get to see how strong Goku has gotten. Jackie Chun/Kame-Sen'nin at least thinks it:
Linked with Jackie Chun's comment above that they'd now finally get too see how much stronger Goku has gotten, I think it's fine to believe Chappa-o is above Goku from three years ago. Jackie Chun believed Goku progressed, but is still setted at uneasy with the thought of Goku fighting him. Yamcha also thinks the same. Kuririn doesn't know the guy:
Chappa-o > Goku {Uranai Baba saga]
In battle powers, we can give Chappa-o a noticeable advantage, but not a very big one, considering Yamcha still seems to think Goku can manage something even when he doesn't know whether Goku got stronger or not:
Son Goku [Uranai Baba saga] : 100
Chappa-o : 110
Those kind of comments seem to mirror Jackie Chun's comments regarding Goku's chances against Mummy, don't you think? The kind of reaction is basically the same... the old Goku might not have a chance, but what about the new progressed one?
Then Goku begins fighting this new challenge... starts handling him swiflty, letting everyone with a :shock reaction. Then everyone has seen Goku has progressed and significantly so. Yamcha and Jackie Chun are already impressed by how fast Goku is as soon as he throws the first punch. Kuririn and Yamcha doesn't believe how fast Goku is to block all those attacks from Chappa-o and get even more surprised that Goku has stopped himself into the air with a blast of expelled breath.
Everyone sees then that Goku was not joking during those three years and is there as a real contender. They get even more surprised at the prospect of Goku not putting nearly everything he had got into the fight. Then at that moment the heroes start shaking into their boots at Goku's mighty. But it's worthy noting that both Yamcha and Kuririn are still in the game... they didn't lose their confidence.
Upon seeing that Jackie Chun has also gotten considerably stronger and polished his skills over him fighting a random fighter, Yamcha thinks this will be an astonishing Tournament:
This shows he still hasn't given up his chances at the Tournamet... he is in the game yet, just thinking it will surely be a rather tough Tournament. Kame-Sen'nin also gives us an interesting comment:
Kame-Sennin: I have watched the prelims. Everynone of you may win this Tournament
According to him, any one of them might win the prize money. This seems more than a general comment to incentivate them, considering every one of them seem to agree and say they'll do their best. This would only make sense if the power that Goku displayed against Chappa was still significantly below Yamcha and Kuririn's, otherwise Goku's comment that "he didn't use nearly everything" would be enough to shatter their confidence. It's true that they seem very surprised at Goku's prowess against Chappa-o, but so was Kame-Sen'nin, who should be also way above that displayed power going by scaling.
So, we have so far:
Yamcha ~ Kuririn ~ Son Goku [unknown power] >> Son Goku [displayed power against Chappa-o] >> Chappa-o > Son Goku [Uranai Baba Saga]
Son Goku [Uranai Baba] : 100
Chappa-o : 110
Son Goku [vs Chappa-o] : 130
Yamcha : 150
Kuririn : 150
Son Goku - still unknown
^ Some rough estimations.
Then, we move on to our first battle in the Tournament, and Yamcha and Tenshinhan get to face each other. Both seem completely even until Tenshinhan begins using more of his powers and get the upper hand. Yamcha then uses his trick (the KMHMH), but not even that is enough to stop Tenshinhan's mighty, who swiflty bounces that back and knocks Yamcha into the ground easily. Goku still seems to think the power they both were displaying when initially fighting to be amazing, and call them both awesome. This would also lend credence to this fight being at a higher level than the power Goku used to deal with Chappa.
At the end of the fight, Tsuru-Sen'nin says Tenshinhan has still more to show than what he displayed in the fight, obviously indicating Tenshinhan wasn't at full power. Then, we get:
Tenshinhan [full power] >> Tenshinhan [using more power] >> Yamcha ~ Tenshinhan [initial] ~ Kuririn >> Son Goku [vs Chappa-o] >> Chappa-o > Son Goku [Uranai Baba]
Son Goku [Uranai Baba] : 100
Chappa-o : 110
Son Goku [vs Chappa-o] : 130
Yamcha/Kuririn : 150*
Tenshinhan [initially] : 150
Tenshinhan [more power, but still not full power] : 200
*We know that Yamcha and Kuririn are evenly matched due to a comment given later.
Then, we move on to Jackie vs Man-Wolf... not much to comment... Jackie Chun easily dominates the man who held a grudge at him for destrying the moon. The fight at least makes Tenshinhan kind of interested in him. Goku also comments how Jackie is good, but that's about it. Jackie ends up hypnotizing the man using Kuririn's head, turning him into a pretty handsome man again!
Then, we move on to Kuririn vs Chaozu. Kuririn thinks the pale one is rather enigmatic and that he shoud have payed attention to his fighting style. They both start fighting pretty evenly, although it's worth noting that Kuririn kind of got caught off guard by Chaozu flying at him all of a sudden. Kuririn moves so fast that Chaozu can't see him, hits him, but then Chaozu kind of regains his composure and they both go to fight evenly, until Chaozu makes use of his Bukujutsu, to which Kuririn is annoyed. Chaozu starts spamming Dodonpas, Tenshinhan learns that Goku knows about Tao Pai Pai and that he was "killed" by him. Things start getting more personal, to the point Chaozu is instructed to kill Kuririn. Kuririn uses the moment Chaozu fires the Dodonpa to hit him with a KMHMH, which visibly hurts Chaozu, who is already panting. Then we see that Chaozu can't take a hand to hand combat anymore--probably because he was damaged by the KMHMH -- and is forced to use his paralysis technique, causing a stomachache in Kuririn. Kuririn notices that Chaozu has to make use of his hands and makes use of a strategy to make Chaozu not use his hands and after a lot of wiggle, Chaozu is knocked out of the ring.
We kind of see that both were kind of evenly matched in the hand to hand combat, but Kuririn seemed to have a lead, and seemed to be too fast for Chaozu some times. It's fine to put Chaozu at 140, I guess. Maybe a bit higher (considering that'd make up for a 93% gap), but let's opt for a cleaner number.
Tenshinhan [full power] >> Tenshinhan [using more power] >> Yamcha ~ Tenshinhan [initial] ~ Kuririn >= Chaozu >> Son Goku [vs Chappa-o] >> Chappa-o > Son Goku [Uranai Baba]
Son Goku [Uranai Baba] : 100
Chappa-o : 110
Son Goku [vs Chappa-o] : 130
Chaozu : 140
Yamcha/Kuririn : 150*
Tenshinhan [initially] : 150
Tenshinhan [more power, but still not full power] : 200
Goku easily defeats Panpoot, that wasn't even a fight considering the quickness of it, but I think we can safely put Panpoot at 21st Budokai Goku's level consideirng their feat of breaking up the arena wall seem to kind of match each other. But, considering the scale starts with Uranai Baba Goku, we won't include Panpoot, who was seemingly a very gifted kickboxer, from the looks of it. Tenshinhan and Tsuru are impressed by Goku taking him down the way he did, altough Kuririn isn't impressed, nor is Kame-Sen'nin.
Then, we move onto Tenshinhan vs Jackie Chun. Kuririn thinks Jackie has got this, but Goku isn't so sure and says this Tenshinhan guy is rather strong. Kuririn is impressed at the thought of Jackie Chun matching up to Tenshinhan, which is kind of weird, but ok. I don't see a reason for Tenshinhan to start with a lower level against Jackie Chun than the one he used to defeat Yamcha, specially seeing that he also seemed to treat Jackie Chun as a bigger deal.
Both have a pretty evenly match from the beginning, but Tenshinhan seems to take advantage by seeing through Jackie Chun's technique with his third eye. Jackie Chun says he has to get serious, takes off his shirt, quickly catches Tenshinhan's hands and kicks him away. That probably shows he increased his effort, like he himself said:
Jackie Chun [getting serious] > Tenshinhan [initially] >= Jackie Chun [initially]
Then, it seems Tenshinhan increases his speed as well, given Jackie Chun's reaction when he charges at him:
Jackie Chun regains composure from Tenshinhan's assualt, and retaliates. Both are pretty impressed with each other's abilities. Then, to sum it up, we have Tenshinhan starting at the level he used to knock Yamcha out... Jackie Chun matches up to that level, but seems to get in a slight disadvantage... then Jackie Chun increases his level and seems to hold an advantage over Tenshinhan, who also shows more of his power and gets once again evenly matched with jacke Chun. Then:
Jackie Chun [more serious] ~ Tenshinhan [more serious] > Tenshinhan [knocking out Yamcha] >= Jackie Chun [initially]
Tenshinhan says this old geezer is better than Tsuru-Sen'nin, but it's worth noting he says it just once Jackie Chun increases his effort, meaning his initial level was still, in all likelihood, at most equal to Tsuru. With this, we can conclude that Tsuru's gap over Yamcha and Kuririn is rather considerable... even Jackie Chun's initial level, who seems to match up to the level Tenshinhan used to knock out Yamcha, still isn't above Tsuru, and he just gets such recognition when leveling up. Tenshinhan makes use of the Taiyo-ken, kicking Jackie Chun in the top of his head, who still recovers, although still feeling pain. Tenshinhan is obviously flabbergasted at such old man and wonders who is him. He then gets told he is Kame-Sen'nin, who tries to get Tenshinhan to the good side and bla bla bla. But so far, we have:
Jackie Chun [more serious] ~ Tenshinhan [more serious] > Tsuru-Sen'nin >= Jackie Chun [initial] ~ Tenshinhan [initial] >> Yamcha ~ Kuririn >= Chaozu >> Son Goku [vs Chappa-o] >> Chappa-o > Son Goku [Uranai Baba Saga]
Son Goku [Uranai Baba] : 100
Chappa-o : 110
Son Goku [vs Chappa] : 130
Chaozu : 140
Yamcha/Kuririn : 150
Tenshinhan [initially] : 200
Jackie Chun [initially] : 190
Tsuru Sen'nin : 210
Jackie Chun [more serious] : 240
Tenshinhan [more serious] : 240
Then, we get told by Tenshinhan that Jackie Chun wasn't even using his full power, and that the reason to which he gave up wasn't because he was afraid of losing. He knew Jackie Chun had more to offer. It's somewhat vague whether it's meant to be Jackie Chun's techniques or his full strength, but since Tenshinhan used the term full power, I am going ahead and assume he meant his strength:
Then, Tenshinhan is still a little confused about Jackie Chun, go ask him some things, and it then begins Goku vs Kuririn. Kuririn says an interesting thing at the beginning of the match:
Whilst it's obvious that Goku still fought Kuririn at less than full power, Kuririn didn't seem to realize it until Goku pointed out, nor did he called Goku out because of it, which would have been kind of obvious if Goku was still fighting at the same level he used against Chappa-o, a level Goku himself made clear that was still far from his full power. They were evenly matched, but I have the feeling Goku was a little ahead considering Kuririn still made use of some strategies to get the upper hand, exploiting the sun light and things like this, similar to Cabba in his fight against Vegeta in Super.
Kame-Sen'nin [more serious] ~ Tenshinhan [more serious] > Tsuru-Se'nin > Kame-Sen'nin ~ Tenshinhan [knocking down Yamcha] >> Son Goku [vs Kuririn] >= Kuririn ~ Yamcha >= Chaouzu >> Son Goku [vs Chappa-o] >> Chappa-o > Son Goku [Uranai Baba Saga]
Son Goku [Baba] : 100
Chappa-o : 110
Son Goku [vs Chappa-o] : 130
Chaozu : 140
Yamcha : 150
Kuririn : 150
Son Goku [vs Kuririn. initially] : 160
Jackie Chun [initially, vs Ten] : 190
Tenshinhan [knocking down Yamcha] : 200
Tsuru-Sen'nin : 210
Jackie Chun [more serious] : 240
Tenshinhan [more serious] : 240
Then, Goku made clear that he stil wasn't fighting seriusly, to which Kuririn was like "Darn, what did I tell you?". Goku then used more effort and easily knocked Kuririn down, but he still didn't seem as dominant as Tenshinhan was when knocking Yamcha down, considering Tenshinhan basically one-shotted Yamcha after easily bouncing his KMHMH back. So, if Tenshinhan [finishing Yamcha] is a 200, let's say Goku [more effort, vs Kuririn] is a 180, still plenty to have a significant advantage against Kuririn.
Kame-Sen'nin [more serious] ~ Tenshinhan [more serious] > Tsuru-Se'nin > Kame-Sen'nin ~ Tenshinhan [knocking down Yamcha] > Son Goku [more serious] > Son Goku [initially, vs Kuririn] >= Kuririn ~ Yamcha >= Chaouzu >> Son Goku [vs Chappa-o] >> Chappa-o > Son Goku [Uranai Baba Saga]
Son Goku [Baba] : 100
Chappa-o : 110
Son Goku [vs Chappa-o] : 130
Chaozu : 140
Yamcha : 150
Kuririn : 150
Son Goku [vs Kuririn. initially] : 160
Son Goku [vs Kuririn, more serious] : 180
Jackie Chun [initially, vs Ten] : 190
Tenshinhan [knocking down Yamcha] : 200
Tsuru-Sen'nin : 210
Jackie Chun [more serious] : 240
Tenshinhan [more serious] : 240