Start with this guy and follow some of the references. The RMIT study looks like the golden goose but unfortunately the full version isn't available publicly. I'd also have a gander at some historical drafts and compare the hit rate from the midpoint on to the corresponding rookie drafts. For every Swan at 58 there are ten Jacob Schubacks, and a Mumford at 134.Really? Where are these stats? Can you please direct me to them?