Future Warrior said:
So apparently it was revealed that Goku was always in a completely different league than Vegeta and Vegeta himself realized this when they were merged as Vegetto. Also, it was never really implied that MSSB Goku gave the form a power boost or anything, just that he can fight at 100% for a much longer duration. It was implied that Goku actually already knew that he was able to master SSB but didn't bother trying cause he didn't think his body would be able to handle it.
SSB Vegetto >> Merged Zamasu ~ MSSB Goku/SSB Goku (FP) >>> SSB Vegeta > SS Rose Goku Black
This causes so many plot holes. Why didn't Goku fight Rose Black instead of Vegeta and finished him off? Why did he feel as though he wanted to team-up against Rose Black and felt nervous? Was he trying to hide his power for Vegeta's sake? This shit is so confusing.
It contradicts basically everything since Trunks and Goku sparred.
Ch. 15, pg. 37.2.-4
Context: As Trunks recovers from sparring
Goku: “You surprised me!!! I can’t believe you managed to get this far on your own!!”
Trunks: “Ah, well… Even still, it was nothing against Black…”
Goku: “I thought it would be a piece of cake, but I guess we’re in trouble…”
Not only did this imply someone that could stomp Trunks was "trouble" for Goku and Vegeta, it now looks like a lie.
Ch. 20, pg. 19.4
Context: after Goku Black transforms into Super Saiyan Rose
Goku: “Vegeta. Maybe we should actually start working together now?”
Vegeta: “Don’t mess with me. You go take care of the other one! This isn’t gonna get anywhere if he keeps reviving and powering up.”
Lie.
Ch. 20, pg. 30.1
Context: after Vegeta’s been defeated
Trunks: “Goku! We must retreat! If this keeps going, we’re all gonna die!”
Nonsense.
Ch. 23, pg. 29.4
Context: after Goku is knocked into a building
Goku: “I’ve got no power left…”
Masochist.
Ch. 22, pg. 35.1-2
Context: Goku has just turned Super Saiyan God
Trunks: “What?! You’re also gonna use Super Saiyan God?”
Goku: “I lost quite a lot of energy using the Mafuba. Going Blue right now won’t work for long. Well, for you, I guess this is more than enough.”
Note: He’s talking to Zamasu at the end there.
We knew this was a lie from the moment Goku went to fight Merged Zamasu.
Ch. 23, pg. 25.5
Context: after Goku is hit by a Klangite cube
Zamasu: “Those are Klangite -- the hardest known material in the universe. Can you not even hold your own against mere objects?”
Ch. 23, pg. 26.2
Subject: Goku
Trunks: “At this rate, he’s most likely going to lose…”
Ch. 23, pg. 26.3
Subject: Goku
Gowasu: “If he could only make his stand for one more hour… However, as far as I can see, that might be beyond all hope…”