i think a good suggestion is this,
if you have player that has somewhat skills to play at a high level of play but is not better than your starter. a good mix is to this,
try putting let coach decide and let your best player on that position be coming off from the bench and start your subpar guy.
youll see somewhat the coach balancing to let your best guy play also heavy minutes if needed too also it eliminates you to play 48 minutes to those trainees you need.
if you can play in those 2 games that player for about 8 to 12 minutes total, you have better chance of getting 48 minutes after the week.