I’m sorry I didn’t read all the posts, but I’m going to tell you basically what Tom would tell you. I spent the last weekend with Tom up in Detroit, and I helped coach the younger group of kids (14 and under). Through the course of the weekend I learned many new fixes, especially for younger kids, that I didn’t know before. (The other times I’ve been with him have been 1 on 1.)
Anyways back on point. This is what I see with him, and what I would say if he were on of my students. (I also instruct in addition to being the varsity pitching coach at my high school at home.)
1.) He’s got a definite issue with balance and posture. His head (I would say torso also but it’s hard to tell if his torso is leaning from this angle.) has definite movement to the his glove side which leads to negative stress on the fronts of both the shoulder and elbow.
The Fix: Tell him to think sidearm. What should happen is he will think he is throwing sidearm but really its the same arm angle but his head is straight on the target instead of drifting off to the glove side. It’s also a strength issue as it is with most younger kids. House would most likely call him a “cannonball on a broomstick,” which is how he refers to taller, skinnier kids. It’s a good idea to shrink him down a few inches to lower his center of gravity so if his head moves a little bit it doesn’t throw everything off. (This can be used until he gains sufficient strength.)
2.) His drag line looks to end off the center line to his arm side. This could also be causing his head to move to the left because his mind is attempting to correct itself. Think equilibrium.
The Fix: When approaching a mound the first thing you should do is draw a center line. Then you take a couple of throws. If your drag line ends on that line, there is no needed adjustment. If, say, the drag line ends to the right of the line by 4 inches, then you should position your back foot 4 inches to the left of where it was posted during that throw, etc.
3.) His glove is very unstable. Sometimes it looks as if he’s really “pulling” or “yanking” it. Another time it isn’t all that bad, but it still finishes a bit too low for comfort.
The Fix: The glove is the most important part of the delivery. Put it this way: A stable glove may allow a pitcher 100 K’s and 25 BB’s compared to an unstable glove allowing the pitcher 70 K’s and 55 BB’s. It’s very hard to throw strikes consistently with an unstable glove. This definition is straight from the NPA: “As the shoulders begin to rotate, the glove needs to stabilize over the landing foot somewhere in front of the torso (between shoulders and belly button).” Basically tell him to put his glove on his chin throughout his delivery. Eventually it will end the “yank,” and he will find a comfortable spot to finish.