There have probably been billions of words exchanged on this topic. I'll keep my reply brief. He did not even compete in the combat sports available to him in a sanctioned venue with world ranked fighters. Thus it is reasonable imo. to assume he would not compete in MMA had he or it been concurrent with one another. He was a showman, and exceptionally bright. One loss and his mystique and career would have been adversely effected.
So, what if, again imo, should remain a Marvel comic series. :awe: