"now imagine goku and vegeta turn ssj god vegito"explain to me exactly what takes more effort to do? a guy that sneeze a solar system or a guy that got upset and for some reason entire galaxy dissapeared, bills would destroy superman and there is plenty of proof to that, besides we never seen NOBODY IN DBZ every fight like bills did, during goku, that they literaly fought in the earths crust and then went into space, even people that claimed to be universe busters never had those feats.
now imagine goku and vegeta turn ssj god vegito, they would literaly beat the shit out of bills and then brench press other gods universes out of existance. lol
Couldn't happen so no point imagining it. There were just enough Saiyains to make Goku SSJG if you take Vegeta away to fuse with Goku then you don't have enough people. Plus Vegeta is anything but pure of heart.