My two cents...based upon what you've shared. Obviously there is more since you stated he is talking to other schools. I would be putting a full court press on those other schools to get their exact interest level at this point in time.
1) 1 week is pretty typical
2) 12 Red shirts seems like a lot, I'd want to know more and why
3) I agree with RJM. Choose schools because of education not the Coach if it comes down to a tiebreaker.
4) If your son doesn't get the AWE factor (as you said) while he is being recruited then I would have concerns when actually joins the program.
Good luck!