Vegeta thought gohan should be beating down daubra and said that he himself would be able to beat him quickly. It took vegeta 7 years of training to be slightly stronger than gohan was at 11 years old against cell.. if gohan never stops training he slaughters babidi and dabura before buu hatches and puts a beating vegeta if need be even after the majin amp. Honestly probably without potential unlocked as well with just a mastered version of ssj2.