I think the critical thing is we've never seen Floyd in a ring with a fighter like Hearns or Leonard. So until that happens, we'll never know how well he can adjust to truly challenging situations.
Maybe Castillo pushed him in the first fight. Maybe prime Judah for the first few rounds. But all in all, Floyd gets it done.
I agree he'd have a hard time keeping Duran out of his hair. But I see him on his bicycle and pot-shotting to a UD.