Pac damaged JMM's chin from all the flush shots. it showed on the Juan Diaz fight, if you get wobbled by a feather fisted Juan Diaz then it shows that you have a weak or weakened chin.
He might get KOed in the Floyd fight.
Diaz isn't George Foreman and he was dominating Marquez, there is no way that he can win in what will be a boring counter puncher vs. counter puncher matchup. Now, once he is gone, I believe that Mexico will be left without a capable superstar. Both Vazquez and Marquez are already mashed and they seem willing to finish both of their careers in a fourth fight.