Mayweather would struggle with all those fighters i,I think McCroy and Breleand would give big problems with their jab and reach and the fighter they lost pressured them and went to body,Mayweather doesent and they would pick him apart if chose to fight on the outside.Brown and Honeyghan would present their own set of problems although would be easier for Mayweather to hit,Curry would strech,especially with this new in the pocket style and standing in front him,it would'nt be pretty dangerous with Currys surgeon like punching with power,and all these guys go to body,something Mayweather doesent experiance,and wont against Pac,as far as the upper tier he would'nt have a shot,a very overrated fighter.
Curry was a better in-fighter than Mayweather for my money. I actually think Floyd would have better success hanging back and looking for his opportunities. Either way, I'd favor Curry.
Curry was a very big welterweight,he had no buisness at that weight when he fought Honeyghan,his physical strength and size would have been a big factor,both have very fast hands,but Curry threw laser like combo's with precision and power,while Mayweather only throws 1 or maybe 2 punches at a time bodypunching from Curry would be a very big factor ib this outcome to.