So, I think you've been given some great advice that has more to do with your son's vision of his future than the actual offers he's received or could receive. As a financially supportive parent, I would spend my time initially focused on what your son really wants and then concern myself with the actual offers. Until he decides on a path or potential path then it is just guessing on a best fit. My son was most interested in playing time and winning a conference title. He felt if he wasn't playing, then it wasn't worth his time investment in a very competitive major. So playing time was huge in his evaluations. There are others that feel differently. My point is to figure out what is most important to your son then go with the best choice. It sounds simple but it doesn't always work out that way.
I 100% agree with BOF's & RJM's points. If your son has received 3 offers from Patriot & A-10 level schools then that is a strong signal about his place in the talent pool.
Good luck!