"That is a silly example to the point that it is hard to relate to my original comment."It is a comment on a comment to your comment, so it need not relate strongly to it.
"100metres has a bias towards fast people? What does that mean?"
It is analogous to the remark that basketball has a bias towards height, and IMO apt, because your claim was about any sport.
"I wager if two males born on the same day on opposite ends of the earth trained 8 hours per day to run the 100 metres eating exactly the same diet and following the same training regime to the same intensity they would post almost identical 100 metres results."
In the "nature vs nurture" debate, that is extremist towards nurture, to such an extent that I haven't heard it before, and find it hard to believe that anybody would hold that a view that extremist. One of those men might have been born without legs, with cystic fibrosis, or just with genes that predispose him towards long distance running rather than sprinting. And yes, those Kenyan runners may not have a genetic advantage in long distance running over other lightly built athletes (http://www.ncbi.nlm.nih.gov/pubmed/22634972), but they surely have one over, say, Samoan men or pygmies.
In a highly competitive sport, you need both talent, hard work and a good environment for training (food, trainers, gym, etc) to become exceptional. You can compensate talent with hard work or a good training environment, and some do, but even for those, having more talent would (all other things being equal) make them even better.