I have multiple scouts and others at the major league level who think I know what I’m talking about and who follow my work closely. I have also spent thousands of hours looking at video of pitchers.
So I think I know what I’m talking about.
I think the issue is that either you never learned about arm slot or whoever you’re following (Tom House?) doesn’t understand arm slot.
I don’t know what this means, but I will say that this kid’s mechanics are pretty standard for a high arm slot guy.
Here’s Hideki Okajima throwing from EXACTLY the same arm slot and doing EXACTLY the same thing with his head.
Here’s Tim Lincecum throwing from a slightly lower arm slot and showing a much more steady head.
Having the kid drop his arm slot maybe 5 or 10 degrees to reduce his head jerk is not radical.
There is no such thing as a natural arm slot.
Any person can vary their arm slot if taught.
How do you know that this kid wasn’t coached to throw overhand?
Everything this kid does is standard for a high arm slot guy.
As is your lack of familiarity with how pitchers actually throw the ball.