Thread:CakeBuu/@comment-32347962-20170509213625/@comment-27996636-20170509224049

I don't know how reliable the source is but it makes sense. Buu is too OP, he is invicible and can regenerate , that's why he was/is known as the most powerful being in the universe. I guess they couldn't think of a way to make him lose, so he had to by his own hand.