Seriously, how can he be that much better then everyone else? maybe (only partly kidding here) he is the first gene doped athlete? If it was drugs, chances are others would be on the same stuff and be at least close. If it was natural ability, he would have been faster earlier (I know he was very fast as a junior, but not like this). If it was the coach, we would see more times in the 19.4s and 19.5s from his stable.
Just doesn't add up.
Maybe it's a combination of extreme natural ability and drugs? Carl Lewis was extremely talented, but is still suspected of being a doper.