It sounds from your post that your son has been exposed to coaches. The PG tournament and the three D1 camps he attended should have given him a real idea of what his chances were to play D1. Did he reach out to the coaches before he attended the camps? Did he follow up for feedback? You say he never heard from any of them. Hopefully he did not operate on the assumption that schools would come running to him and that he did not have to initiate the contact with coaches.
By what you have said about him and his grades and abilities, he should have generated some serious interest at some level. Has he even considered the academic D3 schools, of which there are some great ones out West where he seems to be looking? But the deadline for applications is fast approaching for academic schools if he wants to consider going that route.
Keep us posted on where this goes...this is an interesting case and might be a great story to share with others about how difficult it is to get interest from a D1 despite exceptional academic credentials.