Which other former MW and SMW Champ could do what Jones Jr. did

How would Tommy Burns do against Ruiz?

I wouldn't right him off

 

Roy also failed a PEDs test. Also, knowing what we now know about PEDs it’s reasonable to be suspicious about guys who “gain 20lbs of muscle” quickly while not losing any speed and stamina.

 

Bob Fitz was "triple" titlist in his era.

 

Floyd Patterson started at what would be today a super middle. I think he could've taken Ruiz. Archie Moore began his career as a middle weight and I think he could've taken Ruiz as well.

 

B Hop and Michael Nunn I believe could've possibly done what Jones Jr and Toney did. Its extremely hard thing to do, fighting middleweights compared to fighting heavyweights is very different. Heavyweights aren't as skilled and quick but they are stronger hit much harder and are very tiring to fight. James Toney was especially impressive as hes fought a bunch of fights as a heavyweight and has not been dropped to my knowledge and has fought all his fights in the pocket with much bigger men including the very hard hitting Sam Peter. Andre Ward has talked about going up to heavyweight and I'd be really interested to see how he'd do. Maintaining your speed with the added weight is tough, Ward would need it in order to out box the much bigger heavyweights. It may be more difficult these days with how massive the heavyweights are.