I suggested earlier that the Pot be show as a 1-99 stat and instead of having a cap on skills(unless they are physical ratings) that pot be how quickly a player can grow with how well he produces. You could draft a Alex Smith who looks to be a great QB but he has no pot therefore even if he were to produce very well he wouldnt grow quickly.
On the other hand you could get a Mario Williams with great talent and solid pot become a supwer star. You could also get a Jay Cutler/Tom Brady who has everything you look for in a QB and Has great pot. Brady took off like a bat outta heck when he got his first starts that would be the example of a player with 90+ pot.