As all of those who watch DBZ know, Gohan lets the Supreme Kai raise his power lever in order to defeat Buu.

Well, Kai says to Gohan in order to release his new powers all he has to do is power up like he does into SSJ.

So he does and for the first time we see Mystic Gohan and he looks normal, which means that Gohan no longer turns SSJ, instead of turning SSJ he just powers up to the Mystic state, correct?

If so, then how come in DB:GT we see Gohan turn SSJ rather then his new powerful form?

Just curious =x

And why do they cheat to gain power?
Gohan has done it twice ((Guru + Supreme Kai)) as has Piccalo ((Nail + Kame))