Well potential of a player is based upon a lot of factors. One of them being comparing a player to another player with similar skills and abilities and looking at what they were able to do with their careers along with looking at how far along that player has come thus far. Also you have to look at intangibles. Size, athleticism, intelligence, leadership, instincts, work ethic. Things you can't teach. Most players are much better than they were coming out of college. It's as simple as the fact that the more you do something the better you get. The higher the competition the better that makes you. Most players improve in the NBA but few boom and likewise few bust.