Interesting. Thanks for the info.
Actually, the real reason is a bit more prosaic. In young leagues teams usually haven't done extensive scouting during the season. Plus, teams with computerized owners draft at random. That makes it possible for a really good player to slide all the way to the middle of the second round.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."