Originally Posted by Seamus
I don't have my Greb record in front of me so going from boxrec, your are correct. However, Greb was pretty damn green in 1915 (Gibbons slightly less so) and had in fact just lost to George Chip and lesser lights like Wenzell and Borrell and of course the KO to Joe Chip a couple years earlier. He certainly was nothing like he was 5 years later. Gibbons had already fought and beaten Miske a couple times and Borrell. He was bit more developed.
If Dempsey had fought Gibbons 4 times, especially starting in 1915, I think the odds were he would, also, have at least one loss... but going for the best opponent was not usually his M.O.
Well, there's no harm in speculating.
All I can say for Dempsey is that he beat Gibbons, an excellent boxer, clearly, coming off a 2-year lay-off (which involved burying his head in starlet muff* as his idea of keeping 'in trim'.)
That's a fact.
* line borrowed from Seamus.