If we gave Calzaghe Hopkins opposition and have him fight to 44 he would have a few losses
A 43yo Calzaghe would certainly lose to a 36yo Calzaghe
Could Calzaghe beat a prime Taylor at age 39? Could he beat Tarver at 40?
Could Calzaghe make 160lbs? Nope, hence he loses all those fights on the scales