Andrew, here's an important statement from the article you linked:
In retrospect, there are good and bad drafting teams. But in retrospect, there are people who make lots of money picking the stock market and flipping houses, and there are people who lose just as much money on the same endeavors. The true question of whether something is skill or luck is if it is repeatable. I’m not saying the door is closed on the issue, but there appears to be no real evidence that picking winners in the draft is a repeatable skill.
It all depends on how you define repeatable. Certainly there are plenty of misses for the best evaluators, but you then have to define what "success" is. Much of what Chase Stuart has done here is to look at the draft value chart that Jimmy Johnson invented and see if there is a better model. In this article it is pretty clear that Stuart does not think trading is either a good or bad thing. He judges them according to value, which is what I was saying earlier today.