quote:
How might this effect velocity?
He is opening up and losing leverage by doing this and it will have an impact on velocity. There is a saying in pitching coach circles that "the glove side is for the coach and the arm is for the pitcher." You can not see it well from the angle you have so it is hard to tell, and you really need to load video into a system where you can look at it in slo mo from the front view and side view. Again this video is not the best for critiquing mechanics.
Two things I can see from the video, his leg drive (front leg) looks like it is too much "around his body" IE have him be more linear toward the plate and drive his heal toward his target, it's not a huge thing but it might help him some, and his glove side is wrong as WapakDad pointed out. He should be ending up with his glove toward his chest. The way to get a pitcher to feel this is to take his glove out in front of him and have him rotate his thumb up as he brings it to his chest. Old school pitching instructors used to teach this glove pull down, which is all wrong now days they teach glove to chest.
Overall he looks pretty good I think with a few minor adjustments his velo will come up 2-4MPH. I am kind of surprised a pitching coach somewhere along the way has not mentioned this to him.
BTW can the hitting video, no one is going to recruit him for his bat, he should focus only on LHP again IMO.