It really isn't. Yeah and that's why a lot of today's main event superstars are more likely to defeat the stars of the 1940s. How would they be able to keep up with the pace and the athleticism of the athletes today? Look at what Thesz does in his matches and the damage he takes compared to what goes on in a John Cena match. So it really isn't bad to argue that a modern guy can beat one from Thesz's days. Thesz wouldn't be used to such a pace or such pain. He did indeed wrestle in all of those decades but there was hardly any evolution in what he did. I've watched a few Thesz matches from the past and even if you watch his final match in 1990, he still does the same thing. Bear in mind what Cena does is completely different to what went on back then. Thesz wouldnt be able to adjust as easily as you're implying.