The difference is basically that Gerald was a great puncher, but Monzon was a great, great fighter...able to deal with punchers, shut them down pretty much by negating their powers, and then imposing his will on them...making then do what he wanted them to. He would have done this to McClellan all the way into the deep waters of the 13th round...maybe even sooner. The fight wouldn't go the distance...a tko or ko for Monzon.