Cant beleive I ddn't see that one reply...
Anyway, to answer Majin Gotenks: You dont know if Vegetto could have Ascended beyond
"SSJ2" at that time, I dont even think he went SSJ2, I think he just went up by one level. And even if that WAS SSJ2, he got to it pretty fast.
Saiyans that ascend and attempt to transform to their newest level always take like 1min to a few seconds more to transform, it takes them a while. And I agree that Vegetto
have more of Vegeta's personality is somewhat cool too. He did serve under an army for like 20 or more years so im pretty sure he knows what to do. And it wasn't Vegetto's fault for "not lasting long", who would've thought the fusion would break inside buu? If you were Vegetto you wouldn't have predicted that either. Anyway, they could have stayed fused inside of buu too, but Vegetto let down his barrier. If he had kept it up he will have stayed in that form, but staying with the barrier would have made them slowly run out of ki.