From wallflowers to wonder boys

Because baseball drafts players directly out of high school at an age where most players are still more physical tools and projection than skills, there's a low degree of predictability around how most of these players will develop. Sure, every draft has its can't-miss high school players, and the track record on those guys is pretty good (but not perfect -- see Young, Delmon), but plenty of lower-round high school selections have gone on to become impact players in the majors.