Hy!

That's my idea: you can choose a player, who will be the mentor for your rookie player.

The mentor player's need (for example) 5* BPOS, and X week in the team.

For example: You want to educate the rookie for QB, than you can choose your starter QB for his mentor.
and than, there is 3 level:

Good: - The mentor will help - and the system give some extra expereience, and skill points
Neutral: - The mentor don't help for the rookie, but don't prevent
Bad: - the mentor will pull back the rookie. The rookie will evolve slowly

One player can be once a mentor.