For example, whenever people bring up Cotto being badly rocked by Corley and Torres they point to the fact that he was weight-drained from having to make 140. I don't doubt that this could be true, but I have never seen convincing evidence presented as to how it would affect his chin. Is it just something as simple as the fact that being dehydrated etc. would make a person more prone to passing out/dizziness? I can easily understand it eroding a fighters resistance to body punches, but how does it affect a fighters ability to take head shots?