Prime GSP and Jon Jones are the closest to a perfect fighter you'll find, but they still have weaknesses. With GSP, his weakness is striking in the pocket, he can take apart or at worst be even with anyone on the outside, and if you get inside on him it's a free takedown. But if you can stay in the pocket he doesn't have the punch combos to do real damage, nor does he defend all that well from there, and that's where you can hurt him if you can get there and stay there. If Wonderboy can get into the pocket and unload, then GSP's going to be in trouble. On the outside they're probably even, on the inside GSP wins, but get in that pocket and Thompson can do some serious damage. Ain't gonna be easy since GSP will either open the range or close it all the way for a takedown.