You will get much response to your response 
You now have me more curious about the major. Since Embry Riddle is included, I assume it may be related to engineering? If so, you can do a search in the threads on this site where you will find a ton of info regarding the baseball/engineering combo.
You will also want to be aware of the significant challenges of both the walk-on route and the idea of targeting D1 schools as a senior. Search those as well.
Most of those schools, obviously, are D1 and some, across the country as well... unless he has good pipeline connections, he will likely have to either have a truly exceptional skill set or be a part of one of the stronger travel organizations and attend the bigger events in order to be seen by these schools. Yes, you can attend camps but they will want to see that the skill set can successfully compete against top level competition. That typically won't happen at the camp.