At age 15 he won the 200 at the world junior championships. He was 6'5" at the time and towered over everyone else. Most of us could hardly walk straight at that age, especially those who were tall. He was the youngest person to ever compete in a 200 world final. He's one of very few people to win competitions at youth, junior, & senior levels. Unless you think he was doping as a young kid (a ridiculous assertion in my opinion), and he had that natural advantage of speed combined with length, he was simply the best the world has ever seen, and didn't need to cheat for it.