As for building a relationship with the AS.
If your kid heads out of his area for college, that AS's role is done and your kid will be seen by another AS. But, heck, if you like the AS then treat him like any other potential friend.
I have kept relationships (in the sense of saying hi and sitting and gabbing with) with every AS still working the region. Some even moved up the chain and I can text or call them whenever I please (like any other friend). (It came in handy for us; son had eliminated himself from draft consideration because of his college performance. First start senior year demonstrated that he still had the tools. I called an AS who had been promoted to national cross-checker (he had become a friend) and reported about the start. Next start, the scouts began arriving - including from the cross-checkers team.)
It's always good to keep connections.