Calzaghe treats Alvarez in a very different way than what he has been accustomed to. Sweeping a decision 9 to 3 or 10 to 2 in rounds.
Calzaghe is too big and strong. There’s no way a guy with a frame that much smaller is taking all those punches without being hurt (and/or cut)
Canelo looks very strong and durable, and Joe wouldn’t have thrown many power punches. Most of his shots were point scoring ones. We also don’t know if Joe would have been very cagey, or if he’d have gone all out and just bombarded Canelo.