dono. It doesn't need to be 'effective' or advanced, either, it could just reflect some prediction by 2k, or with new players just be random. Have the tendencies, at least usage rate and shooting kind of go into having the player be more assertive as they get comfortable, go into their prime, then maybe start to take a back seat. Then you can have players whose 'curve' doesn't quite fit, and they might be good, but their desire to still wanna be jacking shots when they aren't good anymore would make them a cancer, etc.
Or, more easily, it could reroll every year based on their attribute changes and personality badges + some slight randomness. Could even throw in some tweets like coach says so-and-so needs to be more assertive, and he agrees. Or so and so ready to have a great year. Or so and so is ready to do whatever it takes to win (taking a back seat.)
Those little things are important for making a franchise mode deep. I know I always play multi years if I ever play franchise. It almost seems like most of the dudes who play franchise sim and manage as much as they play the games.
-Smak