Sampson, your post is full of inaccuracies...too many to dispute.
IMO, blacks often dominate sports that require quickness and agility. Its a toss up with strength sports, but often you'll see people of European ancestry dominate in powerlifting and strongman. MMA is not dominated by any race of people and to me, that is the pinnicle of athletics...strength, speed, coordination, endurance, multi-discipline.
A great example of my hypothesis is football. Often defense and running backs are black (speed/agility) and the offensive line is of European ancestry (strength, less speed needed). Its hard to just say "white" cause that involves so many different countries and genetic traits. "Whites" comprise a huge variation of genetic traits. Plus, with all the mixing happening the divisions are becoming less distinct.