Ok my turn to rant
Being a huge Gohan fan, here is my "two cents"
Think about this.. You are the most powerful person in the universe. Anything you could have ever dreamed of, is yours, because you are so powerful. Are you going to "A" go train to become more powerful, and the only way to do that, would be train very hard, which takes alot of time. Or "B" Spend alot of time with your family, and your NEW GF VIDEL?
And if you didnt notice, when Dai-Kaioshin made Gohan Mystic, he became more powerful than SSJ3. Now imagine what could happen.. If Gohan were to get so mad, that he lost control (like he does in key parts of the series) then he would take Mystic to new levels, beyond that of which SSJ could take him. And still so, they didnt say "You are unable to go SSJ" they said "SSJ has become useless to you now" He could stil go SSJ if he wanted to.
Next off, in GT. Yes he was a SSJ, there is no doubt in that. Notice that he is also married, and has a kid. Now what are you going to do? Train your life away, for potentially no reason? Or stay home and make sweet love to Videl all day long? I know what myself and most everyone else would choose..
Good animation though, I like the whole big bang style you made. Why not make a movie of Vegeta being gay, because he was scared so bad of Broli, that he didn't even want to fight him :)