Jim Braddock gets a lot of s**t around here but at his absolute very best he was a very good prize fighter and had surprising pop, so yes he has a chance to do this, although if I were forced to bet it would be on Moorer although his physical advantages other than weight would not be that extreme. Neither IMO was a top 50 ATG.
Braddock was a sloppy non-boxer. Moorer was a tight, efficient powerblaster. Braddock's oversized Hibernian head would wink as it sped past Voyager 2 on its way to Pluto.