about the CPU roster problem

after i choose some player such as Mcgrady as bech player for the CPU,
but CPU use T-Mac as starter after i simulate the game and see in the boxscore.
Can i fix this problem.Thank you

There's not much that can be done about this, the new Assistant Head Coach feature sets lineups and playing time as it sees fit, which isn't always desirable (or for that matter, realistic).