Darkprince410 wrote:
That's not uncertainty at all. He said that he wasn't sure/couldn't defeat Fat Buu just to instill the need for the boys to master the fusion dance even more (in short, he lied to Piccolo, hence the grin). In his "recant" as you put it, he clearly indicates that part of the reason why he didn't defeat Fat Buu back then was because he wanted the boys to be able to handle it and not rely on him to win.
I know,
I pointed that out - I also pointed out that Goku tells Vegeta the same lie - we know it's a lie when he takes on "KidBuu" by himself after claiming his power was increasing. We even see, a few panels into the fight, "Kidbuu" is stronger than any of them anticipated.
Darkprince410 wrote:Chapter: 509 (DBZ 315), P11.4-6
Context: as Goku prepares to fight Boo
Goku: “Alrii~~iight. I’d better go all out right from the start…! If we get done in, then the entire universe will go ‘poof’…”
Vegeta: “Let me see this ‘Super Saiyan 3’ thing with my own eyes…”
Goku: “Is that alright? You just might not get your turn…I can say this now, but the truth is that with that fat Boo, I would have been able to defeat him at the time with Super Saiyan 3…However, I wanted the young guys to manage something…For the Earth’s sake too…”
This means that he knew full well he could have defeated Fat Buu when he told Piccolo that he didn't think he could, thus he lied to him about it, and in turn wasn't unsure of his strength at all.
It'd be one thing if Goku actually physically fought Evil Buu after he made that comment, but he never did. It's clear that Goku's entire confrontation with Evil Buu inside Buu's body was a bluff on Goku's part. He had absolutely no reason to lie to Vegeta about their chances at defeating Buu on their own, but had every reason to lie to Evil Buu about how powerful he was in order to try and bluff his way out of a confrontation. He knew full well he stood absolutely no chance of actually beating him in a one-on-one battle, or even a two-on-one fight with Vegeta assisting him, but he was hoping that his feigned confidence would convince Buu of how powerful he was.
^Stop posting these, please. Source me the material so I can read it myself - so at the very least, we can be on the same page.
Goku was very unsure of his power as a SSJ3, again, it's not about pure output, this fight would mark the first time he obtained the form (to fight) in a living body -
Notice his comment about fusion - for him, that would have been the preferred method of fighting, instead of using an uproven form. He's stronger than Buu - Piccolo felt it, Vegeta feels it, and Goku knows it. But the strain of the form is starting to take its toll on him.

There are limitations on the SSJ3 form, it's not something Goku has mastered yet, and he would rather go with a more reliable option.
Darkprince410 wrote:
Vegeta clearly indicates as he and Goku are watching Buu revert to Pure Buu that he's undergoing another transformation after having first seen him revert from Evil Buu to the "Buff" Buu form he had when he absorbed South Kaioushin.
Chapter: 508 (DBZ 314), P2.3-7, P3.3
Context: after reverting to his South Kaioshin form, Boo continues to change
Vegeta: “…Look…He intends to perform another transformation…”
[ ]
Goku: “…I wish he’d cut that out…”
Kaioshin: “Th-this can’t be…it’s impossible…He’s cha-changing back…”
*Boo changes back into his pure form*
Kaioshin: “…I…I knew it…”
So this is taking place after it's stated that he's getting stronger, so he has already transformed into the state that they said was "getting stronger".
So we agree - he's getting stronger
Darkprince410 wrote:
Then, after he's finished with the second transformation, Goku and Vegeta have this exchange.
Chapter: 508 (DBZ 314), P3.4-6
Context: after Boo reverts to his pure form
Goku: “…”
Vegeta: “……Heh…Heheheh…Look! He’s shrunk down quite a bit!”
Goku: “We did it! This way, we might be able to manage something.”
What were Goku and Vegeta setting out to do earlier that he'd feel the need to exclaim that "We did it!" and they might be able to manage something? Weakening Buu down to where they'd be able to fight him as they are and not need to fuse.
Second transformation? It never sates that he STOPPPED transforming - nor does the Manga ever give credit to the theory of "buffbuu" Certainly not in the scans I posted, and not in the "translations" posted by you. What we see - and what is directly stated is that BUU power drops from where it was originally after he absorbed Gohan and the others, but now his base power is rising higher than it was before. There is no indicator
after this point to suggest that his power went down. None.
Darkprince410 wrote:
Chapter: 506 (DBZ 312), P12.4-5
You just went back two chapters - Sorry, this doesn't make sense.
Darkprince410 wrote:
So even excluding the line that you keep saying is irrelevant, it's clear that Goku and Vegeta were removing cocoons to weaken Buu to where they would be able to fight him with any chance of winning, and it was reverting him down from Evil Buu to Pure Buu that Goku finally felt they had achieved that.
Evil Buu ("we're still simply no match for his strength!") transforms into Kaioushin Buu (“H-hey…Vegeta…His ki is increasing, ain’t it…!?”), indicating a power increase.
Agree
Kaioushin Buu (“H-hey…Vegeta…His ki is increasing, ain’t it…!?”) transforms into Pure Buu ("We did it! This way, we might be able to manage something.") indicates a significant power decrease.
I'm trying hard not to be rude - but how does stating his power power is increasing means that he's getting weaker? How does adding to something make it less? You are reaching so hard are trying to read into what hasn't been stated or implied. To the contrary - we know that "Superbuu" was no stronger than "Fatbuu" and was the baseline for which we were comparing him too. Don't believe me?

At no time does these statements imply a power change. If you agree that "Kidbuu" is stronger than "Fatbuu" by default, he's stronger than "Superbuu"
Darkprince410 wrote:
As such, Pure Buu is significantly weaker than Evil Buu.
Everything I've said is in the manga. I'm not adding things or twisting things to try and make my side of the argument more convincing.
So making a comment about a characters power, and then going back 2 chapters to when the character doesn't exist isn't being a tad bit dishonest? I'll assume it was a mistake on you part and we can just go from here.
And notice, everything I said is in the manga AND the anime. My version of the story doesn't allow for contradictions - yours requires heavy implications that were not stated or implied at any point.