Pacquiao doesn't use a swarmer style like Maidana, which I think is what caused Mayweather much of the trouble. I think Floyd is getting older, so that plays a part too, but since Pacquiao won't be shoving Mayweather into the corner and swinging punches from high and low, I think Mayweather will have the opportunity to use more of his outside boxing skills which I think he prefers at this point.