A walk on with no prior contact with a coach has almost a zero chance of making a team. In his situation he needs to find a good JC where he can play lined up as a back up, and then he should also continue the recruiting process but he will need references. PG ratings, scouts references, HS coach references, etc. Continue to talk to coaches but let them know about his situation and the desire to walk on to a team. Walking on with knowledge and support will allow him the opportunity.