Taking perfect right hands from Shane Mosley shouldn't be a measure of having a weak chin. I'd lucky to be alive after those, don't let Margarito's triple titanium chin fool you
As far as the Zab fight, it's always been a fight to look to for how southpaws can find the small openings in Floyd D. But what that fight also showed is that those holes will be sealed up in a matter of rounds. I went to that fight and in person I thought Zab looked faster than Floyd but floyd was quicker to the draw. After he measured the speed, he knew when to fire and get there quicker. One of his better performances I think, he won the crowd over..most people were going for Zab before the riot.
Also, do you think Zab had a faster left hand or Manny