Yes of course he would have. Weight draining kills stamina and sharpness. Might well have been radically different.
Maybe a tad better, but he wouldn't have won. Still, it was a cowardly move by Floyd. JMM wasn't even allowed to speak on the weight specifics, hence it being billed simply as, "A Welterweight fight". ***** move by floyd.
I think at 130 lbs Marquez would have stood a chance as Mayweather would not have had a strenghth and power advantage that he most definitely had at 147 lbs. Mayweather had all the physical advantages at 147 lbs, at 130 lbs those advantages are less magnified.