I don't think Chisora's ever been in shape TBH. He seems to lack the ambition and determination to train the way a professional should train, which is astounding considering he models himself on Joe Frazier, a real workhorse in the gym and in the ring. Charr was the same for a long while, but the shooting and the surgeries seem to have lit a fire under him. Maybe Chisora can also surprise, but at this stage I doubt it. Well Usyk could potentially beat Joshua so that doesn't say much. I think Charr is definitely competitive with Whyte, who's really no better than Chisora and a lot easier to hit. Joyce is still far too early in his career to say with any certainty how he'd perform.