Cotto is just too quick. Making Margarito miss will take a toll. Margarito has a granite chin though and wont go anyhwere, but may lose confidnece in the latter rounds.
Crowd behind Mexican fighter. Margarito would be well served to concentrate on Cotto's soft body. Cotto treating this almost as a sparring session, picking and choosing his chances for offense.
An argument could made for Cotto in the 4th just like every round and again he may have stolen it at the end but I thought he spent too much time on the defensive.