Will there ever be another small Heavyweight Champ?

Thats going to be difficult because two of those have retired and one is on his way.

But back to the question, of course, i believe this could happen. Someone like Kovalev could move up and certainly make some noise.

Povetkin is one of the best heavweights out there and hes only 6'2, (75" reach)

Kovalev is 6.0' with a 72" reach, dimensions bigger than Mike Tyson.

Wladmir, is not only a superheavyweight, but hes also a great heavyweight. Something most of the other guys, who are up there, are not. So yes i believe someone around 6' could have a good amount of success up there (once Wlad retires).

Adamek (6'1, 75") and Haye both of who had considerable success at heavyweight. Yes i know both of them lost to the Klitsckos, but not everyone at heavyweight is a Klitscko.