Sorry about the black and white, had camera on wrong setting. This is my son, 11 soon to be 12. Has been pitching since he was 9. Average fastball 53-55. His biggest problem is control and would love any input on what you see that may be causing his troubles.
The very first thing that caught my eye is that he looks like a robot. The pitching motion is a fluid movement. While it can be broken down into pieces, there is never a point when one part of the motion should be isolated. In this case, he lifts his leg and holds it. Yes, the leg lift is vital in building power, but it won’t help velocity or control if he stops for a second with the leg lift. It is one fluid motion.
is a recent post of Ubaldo Jiminez’s motion in slow motion. Watch how fluid he is and immediately you will see that he doesn’t pause with his leg lift.
Also, I do not know exactly how tall he is, but using a ruler you can see from the video he is driving only 75% of his height, where optimal drive is 85-90% of a pitchers height. Remember that the legs and the explosive power they can provide are the key to both velocity and control.
His finish also needs to be so that he isn’t falling off towards the first base side as much. Remember, you want him to drive with linear force towards home. Any force that deviates from towards the plate will be velocity lost, as well as control. Think of it like this, you are running and you want to throw a baseball at the same time. It is hard to throw a baseball in the direction that you aren’t moving right? So in other words, you want to have all your body moving home. Have him finish so he is in the ready position to field the ball.
I did not watch the second video. Within these are enough suggestions for you to work on and change. Make it natural for him, then let us know about how this helps his progress.