There is more to Pac then just hand speed. Zab and nor does this version of Shane throw combinations from the angles constantly like Manny. Cotto could neutralized THIS VERSION of Shanes speed because Shane was loading up on his punches. Cotto's Jab and timing was effective. Zab only fights in the first 10 secs of a round and likes to load up on his uppercut, which is probably one of his best punches. Pac on the other hand is constantly moving in and out, in and out -- perpetual motion, from different angles. It was more difficult for Cotto to time him. Also Shane didn't fight Cotto with the same intensity as Pac. Pac was like Aaron Pryor in there. Zab and Shane in his prime are definitely faster.
Pac is faster than both. His combinations beat the **** out of Mosley's and Zab's. Sometimes it looks like it's pitty pat but they have big power. It's unique.