It's easy to say anything but the whole point of this thread is to debate is it not? Should we just all say that Dempsey would never do better than he ever did and Rock couldn't do better than he ever did so end thread? Or should we try to consider the possibility of different results from different eras? I am criticising Dempsey, avoiding Wills and Greb was ridiculous. I know what the issue of the thread is hence my original post.
His best black contender was not granted a title shot. His best white contender had to watch each of his victims get a shot ahead of him. Call it what you want.
see post #19 below, the underlying premise to me seems to be if only Dempsey fought in Marciano's time, he would have run a spectacular record, not a 78% winning percentage.
Jack Dempsey would beat up the old ATGs that Rocky did. I definitely think Dempsey would KO those versions of Moore, Charles, Louis, and Walcott.
My take is that the Louis, Walcott, Charles, and Moore of the nights they fought Marciano would sweep Dempsey's championship opponents prior to Tunney. So my opinion is not only did Marciano have by far the better career performance, but he faced tougher competition.
A lineal champion going unbeaten is basically an aberration, even in a weak era. It is not something that I would be too eager to predict anybody to do.