Up until Kid Buu appears, the reader isn't sure exactly how strong Goku is. We could just omit his speach about being stronger than Fat Buu and have him face Super Buu with the same exact speech and the outcome (according to some people here) would be the same.
Something weaker than Evil Buu needed to be in place, because Goku readily established that he and Vegeta were no match for Evil Buu, with nothing indicating that he was referring to his physical size, nor lying about his chances to beat him.
As for why he didn't just go with Fat Buu, perhaps it was because Fat Buu didn't physically look like a suitable final enemy. Toriyama was already pushed away from using a similar design as a main villain before when it came to #19, so perhaps he just felt Fat Buu would be too goofy looking to be viewed as a legitimate final villain, and chose a new, more menacing design in comparison.
Taskmaster wrote:I'm not going to go back and requote everyone statement, but I read most of what was written.
I'm going to assume, unless someone can point me to a direct statement that says otherwise, that Goku and Buu were dimensions ahead of everyone else, because that's exactly what the story dictates. I'm going to continue to believe that Gohan is pretty tough, but there is still a fairly large gap between him and Goku, with Gohan being inferior (hense Goku's comment about bringing both fighters to 'fight' Buu, in comparison to his comment about Potara 'beating' Buu)
I'm going to believe that Vegeta's speech including everyone - Gohan, Gotenks, himself, Piccolo, because Vegeta already stated he wasn't a match for Buu in his first statement, and like Gohan, is dead too.
I'm going to continue to believe Goku is stronger because I have comments from Daizenshuu #2's interview that don't require me to twist words.
I'm going to continue to believe Goku is stronger because I have comments Yuskue Watanabe, stating SSJ3 Goku was the benchmark for the movie BOG
I'm going to continue to believe Goku is stronger because I have comments from Goten and Vegeta in Dragonball Super that don't require me to assume things that aren't stated.
I'm going to continue to believe Goku is stronger because that's the story Akira Toriyama wrote.
1) Goku states he and Vegeta stand no chance against Evil Buu, with nothing suggesting it was based on physical size at all.
2) Whole context of Goku and Vegeta's back and forth was them figuring out a way of defeating Buu, so Goku's exclamation of bringing them to fight was automatically because he believed they'd win. Let me ask you this: Why would Goku assume that was Vegeta's plan if both were too weak to beat Buu? All they'd do is just get in the way/get killed according to your reasoning.
3) Gohan and the boys were in no condition to fight at all, dead or alive. There's no indication they had been processed by Enma and no other indication they were available in any other form. Vegeta's comment only fits in the context of they were the only two available to fight at the time.
4) You are arbitrarily putting a time frame on a quote that has none to suit your needs. When no time frame exists, the only logical step is to assume the last time we see the characters at all, which is after the time skip. Otherwise I could go and say that it's a quote about the Cell Games, since, after all, no time frame is given, so I can arbitrarily state it goes wherever I want.
5) You do realize that a benchmark doesn't actually mean the best, right? It simply means that it's the point that other things are being compared to. As such, the simple fact that Goku is the main character is all the reason needed for him to be the benchmark, even if there are other heroes stronger. He's the benchmark just because he's the main hero.
6) Neither Goten's joke nor Vegeta's statement actually states that Goku is the strongest, and given that Vegeta's statement does indicate that he'd need to surpass Goku "and everyone else" to become the strongest, that leaves plenty of room for others to be stronger.
7) Toriyama wrote that Gotenks and Gohan were vastly more powerful than Goku was, and made up a new form of Buu just so Goku could have a challenge just for him. Evil Buu was too strong, and Fat Buu wasn't strong enough, so a new Buu, indicated without contradiction to be weaker than Evil Buu, was created.