Mosley has power, but he also doesn't, he never hurt Cotto, the only time Cotto lost balance was on a slick spot where MOsley slipped on later in the fight. While Judah was able to hurt or stun Cotto 3ish times, once late pretty badly. Mosley sure didn't show much power when he fought Collazo, He was throwing arm punches. He tends to load up so there is a ton of force but his punches are easier to see coming. Pacquiao's pretty much teleport into your face with surprising power, and unlike Mosley Pacquiao can throw hurting combinations, which we haven't seen from Mosley since he was at 135. Last, but not least Pacquiao can hurt you at range, and unless you are Margarito Mosley usually has a pretty difficult time getting off at range.