My impression ... which could be completely wrong ... is that this kid's mechanics are so completely screwed up right now, he doesn't know whether he's on foot or horseback.
I would guess ... guess ... that they are going to start from the beginning and rebuild his mechanics. Like the cat in the video - which was good - with the shoulder and the elbow ... but also hips, feet placement, weight transfer ... the whole she-bang.
And if they are successful with that ... the release point is altered.
Just my impression.
As this string demonstrates ... someone says "change his throwing motion," and Tim Tebow is almost immediately mentioned.
I just don't think that sort of thing is what McVay has in mind.
Then again ... maybe he does.
Who am I to say.