I'd slightly favour Mosley, just. I'd slightly favour the Pac who beat Cotto over this version of Mosley, just. I think Pac had just started to slip by the time he fought Mosley, though clearly not to the extent that Shane was past his own peak.
This Sugar Shane might be peak or at least the start of his peak and was fast as the recent wildfires in Southern California. His problem was taking rounds off midway through where Pac would exploit that inactivity and make him fight a bit too much. On the flip side Shane had the speed to keep up with Pac and unleash his powerboxing style to make things interesting. Could go either way...