There is no one out there as fast as Mayweather right now, so Mosley can't prepare DLH for Floyd's speed, but he's the closest thing.

Shane and Floyd do have much different styles though. Floyd has always used his speed to execute a prefect defensive scheme, whereas Shane has used his speed to dive in and throw combos.
Floyd is more Pernell Whitaker, whereas Shane was always more Meldrick Taylor.