Which is exactly what you are coming up, your opinion backed by nothing.
Black people, ON AVERAGE, do have some physical talents (sprinting, jumping, etc) that give them an advantage over whites. However, it is a skill sport, so these can be overcome more easily with perfection of skills (shooting, dribbling) and strategy (team dynamics) than in a pure fitness sport like running where skills and strategy matter little.
Do you think the average 6'9" person does not have an advantage in making the NBA over the average 5'4" person? Of course he does. And if there was an ethnicity with a plethora of 6'9" people and one with 5'4" people, do you think the former would have the advantage? Of course. Stop being absurd.
What's your point? West African descended people live in Jamaica. Their success if entirely compatible with the "the best genes/talent rise to the top" theory. THey have produced many champions just as the american blacks, like some Canadian and British blacks, and even some west african or other caribbean nations have. THE BEST WEST AFRICAN DESCENDED SPRINTERS ARE MORE TALENTED THAN THE BEST EURO DESCENDED SPRINTERS. Are you disputing this???? Of course culture always plays a role, but genes are supreme, if they are given a chance.
Not facts, your opinion. They are better because they have more talented runners that rise to the top.
skill sports are different than running. No matter how many hours you practice running, you are much more bound by your talent limitations than in a sport like ping pong, in which no special physical requirements are needed to excel. Hand -eye coordination/reaction time might be somewhat inborn, but it is malleable to a greater degree than endurance performance, where too much practice results in injury, sickness, physical burn-out, and stagnation, unless your talent is supreme. Sorry, ping pong is not distance running.