Looks really great for 10U, velocity looks good and mechanics seem to be repeatable. I don’t know if you noticed he got away with the balk at 1:14-1:15. I like the idea of a changeup but his hand might be too small for a circle change, how about a palm ball or a straight change for right now? Keep working location on his fastball, this will be invaluable later on in his pitching. I could see him working a bit more on getting a flat back at the end on his delivery
Not to disagree with you, but I dont really think that his velocity is 64-68, I would assume that the distance is 46 feet or maybe 50 feet, I would imagine he is around 55-60 mph based on this distance, time to the plate and the trajectory of the pitches. This is a very good velocity for 10u and I wouldn’t be concerned, this still puts him at close to 80mph as he enters HS if he adds 5mph each year.