Does Calzaghe have the opponents to be considered a true ATG?

[El Gamo]

I think he's only a Bernard Hopkins away from a being a top 50 ATG's

Agreed. 1 more big win,over Hopkins and he could be an ATG,definitely at the lower end of the list though.

So a win over hopkins would do it? So what does a loss to hopkins do for his legacy?

Doesn't hurt it that much. He has done what Bernard has done-ruled a division,unified the titles and wiped away the competitors.Now he needs to move up and beat a top,top opponent.The 2 best names on JC resume are Lacy and Kessler,2 hungry,young,champions,both undefeated. The best 2 names on Hopkins resume are Oscar and Tito(2 smaller guys)maybe Tarver too although I never rated Tarver personally. So JC is not too far imo. And yes,I think he can beat Bernard and I REALLY hope he does.