Originally posted by Soljer
Cosigned, Super Buu was so much Goku's superior that he was willing to permanently fuse with Mr. Satan even if it would only present an infinitesimal increase to his chances.Against Kid Buu, however, Goku could have easily beaten him with the full power of SSJ3 meaning that Gohan or Gotenks could have easily schooled him as well, even quicker and more easily, in fact.
That was after Gohan was absorbed though. He didn't have any problem going to fight Super Buu with Piccolo being the main one.(Unless that was part of the fillers I can't remember anymore) It was Gotenks absorbed, who was even stronger than Gohan and then Gohan absorbed that he couldn't fight. Just because he could fight Kid Buu and live doesn't mean Kid Buu was one of the weakest. I think Gohan or Gotenks absorbed Buu are stronger than Kid Buu but not Super Buu in is weaker forms like base or with Piccolo.
If they could sense Kid Buu's power then it makes no sense that Vegeta though he could take Kid Buu when he first appeared and so did Gokou and they didn't even go past ssj. So Gokou saying he could take Kid Buu if he fully powered up may or may not have been true. I don't even think Kid Buu used all of his power. Not to mention he wasn't loosing any energy at all while fighting Gokou, Vegeta, or Fat Buu.