My 16 year old has been struggling on the mound recently. We have uploaded two videos of him. The first one (in black shirt) was taken 6 months ago when he was throwing with accuracy and velocity (mid 80s). The second video (in red shirt) is more recent during his struggles. He has lost both velocity (probably 5-10 mph) and control since then. He has lost the “whip” in his arm that’s evident in the first video. To me it looks like he is getting his arm stuck behind him in the second video almost catapulting the ball rather than throwing the ball. He has the ball much closer to his head (more elbow flexion) as he transitions to maximum external rotation (view videos at/around high cock position). His arm motion looks very unnatural to me now and I am concerned about injury as well. He is a big kid (6’4") with long arms which don’t seem to be getting through to release.
Looking for help please.