Nah they should keep the same move sets honestly. Save that work for potential new characters. No reason you should be able to create a team of just goku or vegeta.
They could really create alternate costumes for almost everyone, like great saiyaman for adult gohan, krillin with hair, tracksuit 18, fused zamasu for goku black, tien in his original clothes, base form frieza, etc.
They could sell that shyt and make extra money while saving character spots for new characters.
I'd rather see master roshi and raditz than another form of goku. So many characters in the dragonball universe that they could add but they waste two character slots on slight variations of characters all ready in the game.