Kessler and Taylor would be the toughest match ups. I don't see Jermain dealing well with Joe's frenetic pace. JC already beat Kessler, but I tend to give Kessler the benefit of the doubt because of the injury to his right hand. He had surgery right after their fight. A rematch would have been a closer fight.
A better question would be how Hopkins and Jones would fair versus the super six, since Calzaghe's legacy has been (wrongly) based upon those wins. Of course, Chad Dawson would beat them all...including Calzaghe (too bad he retired at the age of 36).
Joe is terrified of Chad Dawson,why its because of a 5-letter word that joe hates to hear and stays away from and thats "PRIME",Dawson is in his prime,so of course Joe dont want no part of him Any of the super six has a chance of beating JC,Like i said before it doesnt take a great fighter to beat Joe because hes nothing great himself