That is excellent about your son serving as "mentor" to the other lad! You really just never know how it's going to pan out, especially once they hit puberty. My daughter's really kicked into overdrive when she hit her early teens; my older son's appeared to go into remission at his early teens and is now (early 20s) starting to rear its ugly head again. Ry's has been more constant, although he is far more flexible than either of the other two. Go figure :-)
As for being a face of AS, Ry has mixed emotions about it. He was initially honored to be a part of the exercise slideshow put out here, then he got concerned. However, it wasn't until he left the high school team that he gave the coach a "rocket" for various things, that he found out the coach never knew he had this condition, in spite of it being on all his physicals! Great job coach (insert smarmy smirk here). He had been concerned that the coach wasn't playing him because of his condition. Turns out that wasn't the case at all. Ry's a sensitive kid...I can see him advocating in the future for this. I do get why athletes hesitate to say anything that could jeopardize their potential future in a sport though. Tricky situation.