There are several huge red flags - 1) we need to slow him down, 2) shouldn't teach him everything now or there won't be anything left, 3) he has a lot to offer the group.
I second that but have a question: Is his test scores high enough to get into the Davidson Institute? b/c if they are they provide an advocate to help with these matters.
I am sure the more seasoned members will give more advice, but from a researchers perspective I could offer you this. There was an article posted on this site from a teacher's point of view. I will look for it and post it to your string, but it might benefit you to contact the author since she is a GT teacher and is speaking out specifically on exactly what you experienced. She might be able to give you some tips from the angle of a teacher on how to deal with the school.
In any case I totally feel for you and especially your son b/c he is definitely at risk and by the meeting you attended it appears that the P. is going to be no help.
