With young pitchers, it would seem that proper mechanics and speed is critical before one worries about location. My DD has been working with a PC this season and I don't remember the instructor ever mentioning the word "strike" which I believe is the correct way to teach the windmill pitch. I see many young pitchers who "guide" the ball over the plate to get a strike but if you catch them, there is very little rotation of the ball and no speed which to me means there is no wrist snap, etc.