Gambit can't destroy the whole galaxy as you say it can !
why ? because he DON'T control ALL the RAW ennergy !
he channels it too charge something as big as himself... it exaust him to charge far bigger then himself ! that is why you don't see him doing it ! when did you saw blow up a building with the so called raw energy ?
as for XMen vs DBZ...
like i said...
XAVIER = Mind control and force them to kill themself = DBZ LOSING INSTANTLY
BISHOP = absord there blast whatever power they have and rethrow it at them !
CYCLOPS = can duel and even worst with his mighty optic blast
ROGUE = catch them, absorb, and become there equall
STORM = can you destroy something when the whole planet elements are against you ?
JUBILEE = i agree, she is worthless in this fight
those are just example... there are so many telepaths in that comic that DBZ whould just not stand a chance ! anyway, you can't say Kid buu, buu, fat buu would destroy them all as they were never all there. as they are just one and the same !
SSJ4BROLY ?
where did you saw him ?
he has never existed !