Thanks to the wide range of prospects available and their distance from the highest levels of baseball, the MLB draft is notoriously difficult to predict. Players emerge out of nowhere as possible first round picks (or even top five selections), while others slated for stardom start to fall down draft boards. We saw this with current Detroit Tigers prospect Kyle Funkhouser a few years ago; his performance suffered a bit during his junior season, and he ultimately returned to school before the Tigers grabbed him in the fourth round.
Duke outfielder Griffin Conine is a similar case.