A couple more things: First, thanks to all for some very helpful posts. As always, they are much appreciated and this site is a great resource.
Second, it wouldn't surprise me if my son's pitching coach frequents this site (hi coach!), so: I trust it's clear I think very highly of son's PC. I have had a couple of very preliminary conversations with PC about colleges and expect to rely on him heavily. I'm just here to gather all the info I can.