In a sport where height is a disadvantage....
He's a cool dude, but he is obviously doping.
Height is only a disadvantage in the start and acceleration phase, a long stride is an advantage during the maximal phase and the deceleration phase as running velocity is the product of stride length and stride frequency. There's a trade off with long strides and frequency: the longer the legs the slower the frequency of stride. Bolt has one of the slower frequencies but by far the longest stride length.