Well as I said before, let's tackle that later. Right now we have three very clear statements from three different people.
1) After everyone gets a glimpse of Goku's real power ( SSJ2 ), Goku says that Gohan wouldn't lose to anyone if he went all out. He reiterates this point. Gohan would not lose to anyone. One can easily surmise that Goku means that not Dabura, not Vegeta, not Buu, not even himself can defeat a fully enraged Gohan. This doesn't make sense when we talk about training, because clearly Teen Gohan is weaker. But when we talk potential, it makes a lot of sense.
2) Vegeta's very clear LULZ at SSJ2 Gohan and Hmmm at Angry Gohan definitely paints a clear position on where Vegeta stands.
3) This goes along with Vegeta's comments about the two potential powers of Gohan, Kaioshin flat out states that SSJ2 Budokai Gohan is probably not his full power.
Also, we can go with Vegeta's confidence heading into the Budokai as well. Vegeta assumes he is superior to Gohan no matter what, only to find out that he has lost a shit ton of power, yet Vegeta respects the hell out of Gohan's power against Cell.
There are counter argument here for sure, but this picture is painted pretty easily is it not?