Given this, we can't assume that SSJ3 Goku could beat Fat Buu, (even with a dead body) and it's fairly conclusive that the Spirit Bomb he created (with some help from Vegeta's brain and Satan) is significantly more powerful than a SSJ3 Kamehameha Wave. round two: idk GT was none canon and the power scale was so fudged up Yes. Had Goku realized this and taken the threat of Buu more seriously from the start, he could have transformed into Super Saiyan 3, defeated Vegeta quickly -- pride be damned -- then rushed over to help Gohan. Goku said he could have defeated Kid Buu from the get-go when he was still at full power, but he didn't because he wanted to give Vegeta a shot. The Mystic Form makes other transformations unnecessary, as said by the Old Supreme Kai. SSJ3 Goku is weaker than kid buu All forms and transformations allow the person to use a greater amount of their potential power. So, the GSK "weakend" Buu, but it ultimatley didn't matter. Therefore Buu never hatches, the Earth and many other planets never blow up, and Goku's wife and friends are never into chocolate and eaten. Chapter: 509 (DBZ 315), P11.4-6 Context: as Goku prepares to fight Boo Goku: “Alrii~~iight. Goku actually stated that if he could've returned to the Earth, he would've beaten Buu all by himself. Yes. I’d better go all out right from the start…! Meaning that when he faced Majin Buu for the first time in SS3, he didn't actually went all out. It's not off-base to assume both Goku and Fat Buu were holding back. But Goku wasn't holding back. ssj3 gotenks= super buu >ssj3 goku=> kid buu easily. Beerus one shotted SSJ3 Goku from Battle of Gods who was likely far stronger than SSJ3 Goku from Buu Saga with no effort. And we know why he didn't go full out. Could goku have beaten kid buu in super saiyan 3? Vegeta stated before that Goku in SSJ3 at full power could’ve OBLITERATED Kid Buu. Kid Buu = SSJ3 Goku ... Now, Goku admits he can beat Kid Buu. So: SSJ3 Goku is stronger than fat buu. @gelato_exotic: goku states at full power he could beat kid buu. round one: kid buu cuz he beat ssj 3 goku and super buu got shafted by mystic gohan. If we get done in, then the entire universe will go ‘poof’…” So this also says that even though Kid Buu is much stronger than he was a birth, he is still weaker than Super Buu. As for kid buu, in the manga Vegeta thought Goku was holding back while fighting Kid buu so Vegeta could try and fight him. It seems that Goku really was having a hard time beating kid buu. But just minutes before is confident that he and Vegeta could not beat Super Buu. so just watch the episodes and hear what goku … ... vegita finishes to fight him he was telling him that he was not in full power because he wanted vegita to fight against kid buu so thats why he dint beat him with it . 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