Toney was perpetually out of shape. He also fought frequently, and fought the best in all divisions (whoever would fight him). I think Toney would take Calzaghe at 168 or 175, but this much I do know. Calzaghe has shown no ability to take a BIG punch. He never took a punch at 175, 200, or Heavy...Toney has. Calzaghe has questionable defense, Toney didn't.
I dont think joe has the power nor the style to be able to beat the heavyweight champs, maybe he can tap his way to a decision against some of the slower heavys, but I cant see him keeping them off him. Added weight would dilute his best asset, which is his speed. Toney and jones are also big framed fellas while JC has a skinny frame, I dont think he'll make 200lbs tbh...
Joe is doing more than okay at super middle and is gonna do good at light heavy.. leave it as it is, 'cause he's doin fine and making a legacy there..
Joe-C doesn't really need a Heavyweight title. He's undefeated and an Undisputed SuperMiddleweight what more do you want from the guy.