The bell curve distribution only makes sense if all runners are on an even playing field. No ones is doubting that Bekele is in the .000001 percent when it comes to natural ability. The issue is that very talented runners can use PEDs and become even better than someone with extreme talent because they are bringing another variable to the table that natural runners inherently lack.
Bekele ran 12:37 and 26:17. There are literally billions of human beings. How come nobody has come even close? How come nobody has come even close to Barry Bonds single season homerun record yet we continue to advance every year as human beings? Doping error. Don't be naive. Humans can and will continue to do anything they can to reach the top. Just because a "wise" coach like Renato won't agree and says differently doesn't mean that humans don't lie. Lance Armstrong. Marion Jones. Sumgong. And on and on and on and on