Marciano's competition maybe top during his era but if compared to all eras, it is at the bottom, together with that of Holmes. His biggest wins are against a 37 yr old Louis and light heavyweights Moore and Charles (whom he struggled). Tyson beat Holmes and oblitereated Spinks with absolute ease. That together with a list of huge solid fighters like Tucker, Ruddock, Golota and Bruno. And I considered Tyson's opposition not so good among HW ATG.
Where is Chad Dawson? He's probably worthy of a mention, maybe a strong mention depending on whom he fights next month.
Are you serious??? Do you actually think he can knock Kelly out?? Much better chance of Kelly knocking Jermain out.