How would the Pitsburgh Windmill have fared in this talent laden era? He fights em all from midleweight to heavyweight as he did in his own era. Charles, Moore, Johnson, Satterfield, Marshal etc etc. Let em rip.
Just to set the scene: Heavyweights Ezzard Charles, Champion Joe Louis Lee Savold Joey Maxim Clarence Henry Bob Baker Rex Layne Jersey Joe Walcott Jack Gardner Lee Oma Rocky Marciano Light Heavyweights Joey Maxim, Champion Archie Moore Harry (Kid) Matthews Bob Murphy Bob Satterfield Nick Barone Jimmy Slade Charley (Doc) Williams Dan Bucceroni Conny Rux Don Cockell Middleweights Jake LaMotta, Champion Sugar Ray Robinson Laurent Dauthuille Dave Sands Randy Turpin Jimmy Beau Eugene Hairston Ray Barnes Robert Villemain Walter Cartier Paddy Young
Cerdan is dead, so this is late '49? If he was peaking in time to get to Jake before Sugar, he'd be champ. Weight-drained LaMotta could potentially take a worse beating from Greb than Robinson did though without the stoppage I think. Then you have a motivated, experience MW Robinson tackling peak Greb. ...
Greb was a rare combo of quickness AND roughness I can see him giving every man on your list a good close fight (except Louis but he beats Ezzard Charles) now would he be a triple weightclass champ? Yep.