[lanstein]

Sort of. The minor-league baseball player example is sort of an anomaly - there are certainly baseball skills that one can improve with hard work, but there's not much you can do that will allow you to see the ball out of the pitcher's hand any better. One of the main benefits Barry Bonds saw from the HGH usage was that his vision was markedly improved, and if you can tell which pitch is coming by how the seams are spinning from further away than everyone else, it gives you a very distinct advantage.

A counterpoint to your Michael Jordan example: Michael Jordan, the minor-league baseball player.