We know Canelo likes to fight fighters from any weight class, How would a Froch vs Canelo fight at 168 go, and in what round does it end? Canelo is known to fight light flyweights and lightweights. Fair fight.
After a war of a first half Froch's power takes over as Chaavez swells and cuts up. He gets battered into a late submission ( TKO )
I think Canelo could safely make 147 and beat the likes of a Madaina. I know it's a stretch, but I think it's doable, even at the lower weight for him. That said, once he campaigns at 147, he could officially be a WW. He could then argue for Froch to come down to a 150 catch-weight and be slightly competitive in that fight. But if Canelo met him at 164 or even 160, Froch would barrel through him in such a manner that the Bute fight would look like the tightest match in history.
Canelo is going to have major problems when he faces a taller opponent with a good jab. He's decent but has yet to face a natural 154pounder. Hypejob in the making.
I don't think this is a serious thread but Froch wins of course. Canelo might even be competitve in the first rounds but Froch's power will break him down after the first 3 rounds