Are you talking about the extra 2lbs Canelo has to cut? That'll be no problem for a young guy like Canelo physically. It's more of an attempt at a mental edge for Mayweather, by making Canelo have to change up his usual routine to compensate for the extra 2lbs he has to lose.

If you're talking about the weight advantage Canelo is going to have over Floyd... we'll have to wait and see. Like Inuit mentioned, Floyd has been fighting and dominating bigger guys his whole career.