I suppose he thought Hopkins was over the hill and a soft touch and also it would give him good leverage to goad Calzaghe into a fight if he KO'd Hopkins he could say how much better than Joe he was cos he actually took him out.
The executioner had other ideas though! Amazingly the big money fight for Calzaghe now should he keep going would be a rematch with Hopkins! He'd be nuts to take the fight though he only just squeaked the first one anything could happen second time around.
Could see him being tempted though if Hopkins would fight at the Millenium Stadium in a big money finale in front of his home fans.
Joe won't ever do a rematch he saw how tough it was to beat hopkins in the las vegas he wouldn't take the risk. He also said he doesn't do rematches, so its highly unlikely, but hey its boxing money talks.