Floyd on points. Whilst fast, powerful and a physical force at 135, I was much more impressed with Shane once he moved up to 147. He'd give Floyd serious hassle, but Mayweather would adapt and use lateral movement to offset Shane rather than outpunching him as he did in their actual contest, I doubt Floyd would stand in front of this Shane for too long and risk getting bombed. Floyd of Castillo II takes it on points.
You really don't rate lightweight Mosley highly, Flea Floyd of Castillo II didn't look very good in my opinion.
Although mosley was a force at 135, he still had the same issues from a defensive standpoint which is the inability to deal with solid jabs against someone that can also defend. Mosleys advantage in strength and explosiveness gets neutalized by mayweathers lateral movement and quick, stiff jab. Mayweathers jab and movement coupled with his defensivve skillset and counterpunching win this fight in a competitive but clear decision. 116-112.
Mosley is really underrated at 135. His size style, speed and power means you have to be great to beat him. At light weight Mayweather is just that. Mayweather is too good and too smart for Mosley at any time.
Mosley Ko 9. Head to head at lightweight Mosley is too strong, quick, and explosive. How often does May fight Someone whose speed is comparable?