You're taking extremes to prove your point, which is why I don't want to argue with you anymore, I got better things to do with my time than to chat with you on the internet breh. To make this short:
1) 1 White Olympic hurdler doesn't invalidate the valid results of interbreeding people. I don't have the stats, but I would have to bet at least 30% of most pro black athletes have fathers/uncles/cousins who were/are also pro/collegiate athletes.
2) Nothing is guaranteed in life, everything is probability, however slim. That's why I as a scientist I talk like that. However, that doesn't mean something isn't 90-99% probable. If I take a stud horse, and breed it with a mare of good stock, odds are it's going to produce impressive offspring. That's why the stud horse's semen is worth millions. That's why slave owners would have their most impressive slave copulate with as many women as possible on their plantation. They're playing the odds that will improve their stock. You don't need to be a geneticist to manipulate characteristics. How do you think all the variations of japanese koi carp came into existence? The white Arabian stallion? Ligers? So you're saying the Arabs and the Japanese from the 1800s were geneticists?
3) Slavery in and of itself doesn't have a relationship to black athleticism. Mutombo, Dalembert, Ibaka, all probably came from stock that were never slaves. However the interbreeding that occured as a result of the plantation owner's quest to produce superior slaves has a direct correlation to your average professional African-American athlete.
4)
Birthing A Slave- Book on Motherhood in the Antebellum south
^^^Direct quotes from former slaves from a 400 page book on the topic. This the last response to you breh, let's just agree to disagree.