Doesn't need 2 outbox him. If you go in aggressively thats what Mayweather wants & expects and he'll pick u off. If you try to counter him u won't outbox him but u will land some punches & hopefully if you're Mosely one of those punches will be hard enough to hurt Mayweather. Then u finish him. Trying to aggressively out-work him is a worse game-plan IMO.
Use his speed on the inside to pressure Floyd and tire him, then when Floyd gets tired follow Floyd to the ropes and work him over with those great body shots he has. He is faster than most guys that Floyd has ever fought and stronger, so if he makes it physical that would be Mosley key to winning this fight. He would have to stay on top of Floyd the whole fight and make it a war. Sitting back in ring center and fighting Floyd's fight would not work obviously.
Mosely can knock Void out, but only if he does not throw the fight as this appears to be the only way Void will fight him.