Marciano didn't rely on JUST his power the way Tyson and Tua did vs Lennox. Rocky would wear down an opponent with his aggression and stamina. So once again IF size was not an issue then its a difficult fight to call. But that's not the case, Lennox would tower over Rocky and outweigh him by about 50 pounds.

Rocky vs James Toney is a more fair fight to think about.