Norton is the best example I came to think of right off the bat. He was a nightmare for two ATGs. But he is of course not wrong for all ATGs. Kalambay?
Tho i think Michael Nunn has become solidly overrated in here he is still a fine choice per the topic. In the heavyweights guys like Greg Page (super fast hands, good chin, big right hand and fantastic jab) would be a handful on a good night for many past heavyweights. Jimmy Young might trouble some. In the light heavyweight brigade a guy like EMM comes immediately to mind as many will class him below great. Eddie Booker if one doesn't consider him great. In the middleweights you can simply start with the murders row. At Welter on a good night Marlon Starling might be troublesome. Ceuvas depending on how you classify him. At 135 Edwin Rosario could be a ko chance against some. If you didn't see Fenech as great he could be a nightmare for plenty between Bantam and Feather. Same with Jeff Chandler if considered borderline. Pintor too maybe.
Barkley for Hearns yet Barkley threw punches in the middle of Hearns going for broke when most guys would be covering up. Barkley had the chin to absorb the punches and take a shot at landing, and did. Laing for Duran, yet if you see Laings foot positioning you see how he could move away from Duran and give him trouble. Randall for Chavez, who was at the end of his career, but that right hand of Randall was straight, and in away straight than Mayweathers…
Yeah I do consider him an ATG though, some people don't The guy looks great on film to me and I'm impressed with his record
Ralph Tiger Jones for so many. A journeyman record but achieved scalps like Sugar Ray Robinson, Kid Gavilan, Joey Giardello, Johnny Bratton, Bobby Dykes, Charles Humez and Rory Calhoun. Not much of a puncher but a good jaw and a busy, crowding style gave the elite of the game pure fits.