I think Kessler had an injury that night against Calzaghe or wasn't in great shape for some reason. Calzaghe won fair and square but Kessler seemed a bit tired and heavy-armed after the midway point and that contrasts deeply with his non-stop punching out-put against Andrade. Obviously Calzaghe made him think more and didn't provide such a static target but when Kessler did open up against Joe he looked dangerous. He just couldn't sustain the artillery.
All this bs about Kessler's hand injury. Calzaghe's career was one long hand injury! Groovy avatar though!