Rocky Marciano was a freak of nature, like most great champions. In his era he was terrific. Would he be great today? He retired because of the wear and tear on his body fighting the way he did. Were he starting today at cruiserweight I could see him doing really well, but he'd start having problems if he moved up to fight the big guys, these giants today.
When we finish our time machine, Al, Bobby and I will bring Rocky back and match him with the behemoths of the day. Then we'll all finally know for sure.
Cap