It makes a difference,though. Moore's 4 best opponents (Charles, Ali, Marciano, Burley) is quite possibly better than anyone Robinson fought, as is Charles's (Moore, Burley, Louis, Marciano).
In the overall scheme of things i don't think fighting Burley and Williams would have propelled Robinson ahead. If you think it makes a difference (as you state above) then you imply you would have ranked Robinson's comp ahead of the other pair's if he met Burley and Williams. I'm not so sure.
Greb probably takes this ,but I'm surprised no one mentioned Langford.And ,how about this guy ? He faced_________ Battling Levinsky Luther McCarty Sam McVey Al Kaufman Johnny KIlbane Hugo Kelly Joe Gans Bob FItzsimmons KId Carter Jack O Brien Jim Barry Jack Blackburn x3 Soldier Bourke x4 Dave Holly x5 Peter Maher Dixie Kid x3 Joe Walcott Jack Johnson Not a bad collection.
Yes.... Langford is one of the classiest journey men in the games history. ..... ......Think about it kids.
Lloyd Marshall is up there Olson Farr Cockell Charles Mills Moore Chase Maxim Williams LaMotta Bivins Burley Garcia Not bad.
I have to bring up Everett Martin: Bert Cooper Dwight Qawi George Foreman Bonecrusher Smith Michael Moorer Tim Witherspoon Tony Tucker Riddick Bowe Larry Holmes Herbie Hide Tony Tubbs Wladimir Klitschko Serguei Lyakhovich Ruslan Chagaev