The GOAT Middleweight Hagler, vs the best middleweight today Canelo... (I think Canelo is in his prime currently) I think it'd be a tough match for Hagler in the early rounds, since Canelo is such a good counterpuncher, but if Hagler pushes a high workrate (like he did with Hearns lol) he'll win by KO/TKO. Would be a great fight.
Canelo would land a few counters that make the crowd go crazy but Hagler works him over and busts him up. Late TKO or clear points Marvin.
Sam Langford is legend has it The Morlocks and Luis Ortiz are the only men alive that have seen him fight in person.
You are correct on all of what you have stated if he pushes Hagler into a war he will fall through a corner stoppage while he’s defensively devoid looking to the referee for mercy his face looking like fresh cut steak... or he’ll fight as we know he will and just survive getting outboxed by a legend the whole way to a robbery victory. haha
Hagler would do better against Alvarez, at 160, than Mayweather did against him, at 154. I very much doubt Canelo could have taken Hagler the distance.