(8081686)ok here is a case for you.
Look at Murathan Gülen here.
I have 7 players in that game, I didn't put others in the roster. He was Starter, backup and reserve for PF position. Every of the 7 players were assigned to something. He had 2 Personal fouls but he played 46 minutes, thus he didn't get full training. You basically need to be "lucky" to avoid the guy being subbed randomly.