Not answering your question directly, but...
Does he have a field of study in mind yet? Sometimes the JC route can be quite disruptive, more so with some majors than others. Also, there is, IMO, a much higher likelihood of needing an extra year to get your 4-yr degree when you go the JC route (due to classes not transferring, etc.) so sometimes the savings isn't what you first think it will be.
Another FWIW, it has been my observation that many of the west coast JC's are more likely to roll guys out 'til they drop than the 4-yr schools - this includes those JC's with HC's who have extensive pitching backgrounds. Do your homework.
He is leaning toward the physical therapy/occupational therapy/athletic training fields, which will most likely require post grad work too. My daughter is currently taking the JC route, but her 4-year school is already identified and we know her credits will transfer. Very good point about the transferring of credits though.
We're definitely trying to avoid the play them 'til they drop scenario, but it's very challenging to find this information. I have some feelers out to coaches we know too. Hopefully, we'll be able to get some good information so we can make an informed decision.