@Garn fair questions the first two, but why don't others replicate? Seriously? What do you think they've all being attempting to do the last decade? Clearly it's not that easy, some people like he and Usain Bolt just find a vocation that they have an insane amount of god given ablility in and coupled with the the undoubted amount of hard work in training they prove to be almost unstoppable.
You can't just be the best at something by 'replicating' what the best do.