Yes, but there's also Trunks calling Piccolo "battle ki" on his way of getting where Piccolo and the others were, and when he's first sensed Kamiccolo's ki he noticed how completely different his ki's. Which means he's starting getting respect of Piccolo.
Goku also only took into reference...
Piccolo obviously's leagues above Namek, otherwise him questioning himself if they became too strong shouldn't be one possibility, I'm talking strictly of Healthy Goku and Vegeta. He shouldn't be more than 66% of Vegeta, which's where I have him.
There's also Krillin making one point of Piccolo...
I'd honestly like the idea of Piccolo being equal w/SSJ Vegeta (mainly because I'd consider interesting and a missed opportunity them being rivals who're always competitive w/Goku), but, I find quite hard of being the case. Vegeta considered impossible for a Namekian to be stronger than Super...
Frieza being 80% of Goku seems factual considering Frieza likely went higher than 50% (but below 70%) when stopping Kaioken x20 Goku's Kamehameha.
3 millions numbers even when assuming 2nd form Frieza at full power's the one who surpasses 1 million's faulty given 3rd form increase have of being...
Vegeta's blast was aimed to kill Frieza, becomes clear was stronger than Frieza and he did something similar like when he stopped KKx20 Goku's Kamehameha (e.g he used one bigger percentage of his power to counter it).
My numbers:
SSJ Vegeta: 840,000,000
Final Flash (hypothetical): 2,520,000,000
1st form Cell (Post): 2,800,000,000
Cell would be on slightly better shape than when he received Android 16's Hell Flash, but that's just my prediction.
Now that I'd think about it Broly taking Goku's FP Kamehameha head on's load of bull. I could justify it w/TOEI being unaware of how much Kamehameha increases and/or this Kamehameha being unamped.
Tbf, I have Broly almost SPC level. FP PC definitely ain't taking Goku's Kamehameha w/o one scratch. And I'm starting thinking everyone minus Gohan's CG level on M8 (Piccolo's bloated).
It was just many years ago.
But yeah, if Kid Buu was that strong, he's simply > everyone on DBZ. Which doesn't make sense. This's not retcon, but rather something abundantly contradictive, similar of meditation not being training or other enemies not being much stronger than Goku & Vegeta.
You're either one reacher or trying your best on justifying the injustifiable, all of this bc you can't think out of your comfort zone.
If Goku forgot about that that's also translates on bad writing due to how enthusiasmed he's 10 years after Buu's defeat.