Nobody quite knows the ratio, but player development is a crucial part of the drafting process. Prospects do not come to the NFL as finished products, and it’s up to the team (and the player) to turn that college athlete into an NFL player. Making a selection on draft day is just step one, not the final step. When a player busts, is it the fault or the person in charge of the draft or the person in charge of the development? When a player booms, is it because of the GM or the coach? I don’t know. You don’t know. Nobody knows.