You can monitor your charges to make sure they are fundamentally correct, but you have to give them a trigger to judge their motion against. So by teaching kids the latest theory, you may be sowing some bad habits. While coaches should strive to understand the body motions basic to the game, we need to recognize that our kids don't know enough and don't care as much about the theory as we do. For some reason, the locals down here want to step parallel to the rubber, which pulls the eyes and head off line, and they bring their hands to their chest, which restricts the windup. Get the head and eyes level and lift hands at least to the bill of the cap.
Balance is important.
I have a group of young pitchers stand in this position while I talk about pitching. Leg lift, weight on ball of foot, hands in middle of body, shoulders lined up at target, etc. Look for proper stride length, elbows on line to target, and eyes level and focused. Kids are smaller than the pros, and their hands can't grip the ball the same way our heros do. Release hand reaches to launch point, usually located about in front of the nose.