If I do send him to Headfirst (son always pays a portion of the fee), it will be for the personal contact with coaches.
In my limited experience with recruiting, it reminds me of searching for a job. Resumes and research are important, but it usually comes down to a personal connection. Coaches seem to rely heavily on their instincts.
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The main problem is that if he does not have the grades, the Coach does not have the ability to get him in through admissions, (no matter how talented baseball wise). However, you may be right that there would be a few schools at Headfirst that would have more influence in the selection process, especially if your son stands out baseball wise. I don't know.
As for other camps, we have only been to this camp, the Stanford camp, and PG Academic -- and I agree that Headfirst had the most of any camp we attended. Not sure what else would compare, although people have told me the Fall tournament in Jupiter is packed with college scouts.