"Why is this even a battle? Toriyama said himself that the strongest un-fused character in the series was Mystic Gohan. "Being the strongest does not in anyway mean that you will win the fight, especially if the power difference is so little and somebody has the techniques to destroy you in picoseconds without PIS. (warp kamehameha) It is known that goku was very impressed with gohan's power but his fighting ability was nowhere near goku and vegeta's standard. Kid Buu was not even as strong as goku but he was so close that he suprised vegeta and goku. his durability was key, (regeneration). Gohan is nowhere near kid buu's durability, as he has no regeneration, goku 's problem in dbz is that in the show he was not able to master ssj3, and so it is assumed that after the ten years of training goku was able to improve. However there is no concrete evidence as goku's improvement is unknown. Goku has enough power to wipeout gohan, but I think that if morals apply this can go either way. "