People saying Flair but JTG says something to the effect of "If I kick his ass, I get fired. If he kicks my ass, I'm thr laughing stock of the locker room..."
That kind of eliminates Flair in my eyes because Flair ain't whipping nobody's ass. I'd give Rey Mysterio and Evan Bourne odds on whooping his old ass in a fair one. They could slap him once and he'd cry and offer to carry their bags.
No matter how little you think of JTG, he is still a decently sized, athletic black guy. I'd have to witness it to believe that Flair could whip his ass. I think it might have been Piper or Hardcore Holly