I'm with Papibon about the hesitations. Ditch the balance point idea which has dominated this pitcher's mechanics. Get his centre of gravity moving sooner, sideways, just at or before the apex of his knee lift. Don't get him reaching back with the ball and pausing there. It needs to be smooth and continuous.
Get him some cleats. There's a slide happening there when the front foot lands.
He has a distinct imbalance during the stride where he has lateral movement of his c.o.g. to the right. This hints at a lack of toward the plate momentum combined with a lack of rotation of the right hip around the left one.
When he lands, his foot might be a little too closed off.
Lastly, his glove drops immediately to his waist. He's a victim of one of my pet peeves. The dreaded "point your glove at the target" cue!! He extends it out there, as his throwing arm goes back, and that weight, way out there at the end of the arm, just wants to drop. Go to the video library part of this site and study how the pros deal with the glove arm (focus on the elbow) and how they do not pause and reach back with the throwing arm.