True, to beat Jeffries in 20+ rounds with Corbett style you had to have Ali-like durability. Jim troubled Jeffries but it was just a matter of time for James to break him down. Same happened in Fitz fight. I also agree that Corbett would be much better in shorter distances. I see him as an extremely tough opponent to beat in 10 rounds. You need someone like Frazier to catch him in such a short bout.