I go through the starters playbook knowledge and work on increasing it. I dont see any benefit from having them learn a play the starters already have mastered. I dont bother with the game plan thing since I never use it anyway. The few times I would use "boost top plays" it would end up being a bad play for me.
As far as the NFL Channel announcer goes, he doesnt know much anyway about what goes on at my practices, they are closed to the press
The comments seem too random to me. I guess it helps that when I first started playing the game I kept the sound off because I cant stand the repeating coaches comments.