4. Ben Askren
The ONE FC welterweight champion and former Bellator welterweight champion remains undefeated in his career - and was one of CM Punk's biggest critics when the news was announced that he signed with the UFC. How these two get along in the gym will be key, as Askren basically leads the wrestling side of things at Roufusport. Punk believes Askren was upset at the situation and that it was nothing personal. The gym's head seems to think it won't be an issue. Lets hope not. Askren is arguably the best pure wrestler in MMA. While his striking has developed a little, he's almost a throwback in the sense that he can win a lot of fights with just one discipline.