Actually like another poster said, it gave him all sorts of hell, but Manny adjusted easily because of Cotto's constant habit of ducking down shorter than his opponents as Steward has said many many times Cotto bent INTO Pac's counters. He also allowed himself to jump into Pac's left. Cotto should've been an inch or two taller which would've given pac more problems to jump into the counters and would've most likely either been a bit off mark or flat out countered. It wasn't really what Pac was doing, but what Cotto kept making a fatal error of.
You can make errors all day but its up to your opponent to take advantage of them. To say "It wasn't really what Pac was doing" is IMO completely rediculous.