The chances of him getting recruited just playing high school ball are slim to none, even on a highly ranked team...unless he is exceptional. HS season is the same time as college season and no one is coming to watch "Junior" play unless they are a local school. Summer Travel ball is where he needs to be and preferably on one with connections because alot of recruiting, I hate to say it, is "who you know" or "who your coach knows.
I'm not sure that is true for many D3 programs. By attending Camps & Showcases you can get recruited into D3 without playing Travel