Better record ,but not better technique.I also doubt he would do any better against Dempsey than Firpo did,in fact he might surrender as he did against Louis.
Styles are one thing but degrees of effectiveness matter more. Any style can beat another style if the degree effectiveness is sufficient. It is not a dressage contest: it is a physical contest. And I think he does a lot better against Jack than the Firpo who Jack absolutely trashed except for a few seconds in their bout.
It was a legit KD and Johnson was legitimately hurt. Johnson was down for longer than, say, Marciano was down against Moore. But you seem adamant that Moore shook Rocky right down to his core and hurt him bad Gotta think about things both ways. Johnson's chin is sus