Weight Gain: De Le Hoya vs Pac

[Kirkland Laing]

"Between the ages of sixteen and thirty-one, Pacquiao fought at weights ranging from 106 to 144 pounds. Between the ages of sixteen and thirty-one, Mayweather fought at weights ranging from 106 to 150 pounds."

From Thomas Hauser

Floyd pretty much stopped knocking people out when he went north of 130. Manny moved up to 130 and beyond and his KO percentage improved and he's now beating up elite welterweights.

That can be explained by their styles - Pac is a non-stop attack merchant, Floyd is defensive minded.

As a general rule fighters don't keep their power as they move up in weight. Manny is beating the shit out of elite welterweights. Almost every time he hit Cotto he was hurting him, he almost stopped him in the second round. That's just not normal.