What MMA'ists in their prime do you think could beat the current UFC champ's in their respective weight class?

I think bj in his prime would beat edgar. Im not sure of any welter weight that would beat GSP, although i dont think GSP is exciting, he is still the best. Anderson Silva and Jon Jones i think would both get beat by Chuck. Cain Velasquez will not be a champion much longer, both JDS and Carwin can beat him in my opinion. But i would say Mirko Filipovik would beat Cain.