Eventually Nelo will move on to 168 (his last division IMO) After a tune up or two at 168 If he fought St Groves... Who wins? How does fight go?! If Nelo can take GGG power, no reason he can't take Groves or Eubanks or a guy like Traux Nelo will easily rehydrate to 180+ Size is no issue
Before last night I would've said Canelo by KO. But if Groves keeps him off with his jab and keeps moving, he's got the right style to beat Canelo.
Groves UD or late stoppage, Groves too big, too powerful, too slick, and.... Canelo isn't a come forward destroyer, he's a counter puncher, he struggles with movers with a good jab, that should be abundantly clear to you by now El Chicano.
Groves might stop him but he'd never win a decision over Canelo, in fact nobody would it's virtually impossible, even if his opponent knocked him down in all 12 rounds i'd have doubts Canelo would loose the decision.
If he doesn't he loses 118-110 on the cards and Canelo fans claim it could of gone either way so it doesn't matter.
I would pick Groves in neutral territory, but in Vegas with Oscar's judges, referee, boxing commission and Bob Bennett to protect him, he would find a way to cheat!