Gordon Ramsay has a nice little quote; "Before trying to run, first learn how to walk."
Greg Hardy should work on soundly beating sub UFC talent like the Allen Crowders of the world, and fixing basic problems with his game, like his God-awful stance with head sticking forward way in front of his hands, not worrying about being greatest anything. (Which, when considering the slew of great heavyweight boxers, is especially laughable)
He turns 31 next month; his athleticism is already starting to wane, so he needs to add those skills quickly.