I think he has massive difficulties with him, actually Roger was fast, long, and highly skilled... He was also a lethal right-hand puncher... For a guy who is a natural counterpuncher like JMM, a boxer of Roger's skills and attributes is a tall order indeed Both guys would get dropped I think It comes down to durability... JMM gets hurt a lot, but he recovers well... Roger just couldn't take much punishment at 130, and JMM has the skills to hit him where maybe another guy with enough to pop to hurt him might not be able to... In the end, JMM outlasts Uncle Rog and stops him circa round 8 in a real good fight