McGrain , are we talking Hopkins, or Hagler? In the title you put Hagler, but then in your post you said Hopkins
I'd think he'd probably beat them all, Hopkins too. None would be easy, though. I think Ryan might given him the toughest assignment from those you listed.
Its alright, i have him above them all as a ATG MW, but h2h? It might sound a bit over the top saying he would beat them all, as they were great MWs, but i think Hagler might actually win all of them, certainly had the mindset to deal with the rougher, tougher era imo. In fairness though, id be a bit more well equipped to comment on a placement of these guys on a MW list of ATGs, dont know a great deal about them stylistically. I still pick Hagler though!!!