The only fighter under 6'2 in the top 20 is Derreck Chisora and he is 6'1 1/2. There are only two guys under 230 pounds in the top 20 David Haye who is 225 pounds and Deontay Wilder and he is 222 pounds. Heavyweights are becoming massive.
I've been impressed with a Russian fighter named Rotislav Pletchko he's around 6'2 early in his career so anything can happen but I believe he has the ability to win a belt
Maybe we should be looking at a future dominant cruiserweight who will look to move up eventually to HW like Holyfield once did.
Never say never... But it probably won't happen for a long time. The perfect combination of skill, power, and athleticism needs to be in play for that to happen(like it was for Tyson)