If he somehow beats Canelo and becomes undisputed at 168 how do you think he fairs against the historical greats at middleweight and super. Are these mismatches?
I very much doubt he beats Canelo, as of now, they all beat him comprehensively. He may have some early success boxing against Mike McCallum, but it would be short lived.
If he fights them all at the same time he loses. If he fights them one at a time he loses to all of them.
Neither Crawford or Canelo are SMWs, they are operating in that division because for a few years it has been wide open & weak enough for a big name around that weight to exploit it & grab a bunch of belts.. they are both on some serious gear too.
Both canelo and Crawford lose to all of them, the division is weak and that the only reason they are able to operate at that weight, I’ll also add that bivol would probably lose to all of them as well maybe close with toney but still I think he would lose, beterbiev would probably be a nightmare for Calzaghe, probably beat toney and maybe even get to McCallum.