I don't think that anyone is arguing that a pitcher should not be throwing a breaking pitch in HS. I just don't know why one would need 2, unless his FB is not impressive. The real argument for me is those younger than HS throwing more pitches than they have to in number or in type.
But I do have to say that I have never heard of anyone teaching a young pitcher to throw breaking balls over FB so he can get more out and spend less time on the mound. And I still argue the FB being that most "dangerous" pitch even with the small study provided.
Below is a pic and a report on son his junior year in HS. I don't remember the slider (more like slurve) but that most likely was his show pitch (as mentioned) for showcases and when scouts and coaches were watching This to me seems like a very good time to use that when someone is watching.
We are getting away from the OP's question as to her son's circumstances. Note that the player is 16, uses a FB, CU and CB not sure why he would need 2 breaking pitches. Most pro pitchers do not even use that many.
BTW, the junior in HS (see below) looks like a baby and was not shaving until he went to college (or at least he did to be cool).
See 2003 national showcase remarks. BTW, all of those different slots are now one!
http://www.perfectgame.org/Pla...profile.aspx?ID=9795