When GSP is due to lose I seriously cant see it against Jake, I think itd be to a middleweight when/if he moves up. Some one like a Chael "small balls" Sonnen, Mark Munoz or some other large high caliber wrestler via decision.
Ps- First post here on 10th planet, w00t. Ive been stalking for a while to check it out, pretty chill here man.