Be aware that your son will be a walk on, he has NO leverage as a freshman. I would ask for the front end as opposed to the back end. I am not sure you can put anything in writing that would hold up. Remember that scholarships are renewable and never guaranteed.
Power 5 programs do not have to give 4 year guaranteed scholarhips.
I understand that there are ways to get out of them, but, yes, they have been required for the past couple of years. Former Alabama coach got into trouble just a few months ago: www.tidesports.com/goff-tries-...iolation-ncaa-rules/
"In January 2015, NCAA schools passed legislation that required Power 5 conference schools, including Alabama and other SEC schools, to renew scholarships annually regardless of athletic performance. Previously, most scholarships were subject to annual renewal. Schools outside the Power 5 such as Louisiana Tech, Goff’s previous stop, are not required to renew scholarships annually."
http://informedathlete.com/the...caa-di-scholarships/
Edited to add: they can't cancel a scholarship, but of course they don't have to give a scholarship for year one.