We get that some players will inevitably run into academic or disciplinary troubles, and that a coach is well within his rights to cut such players loose. What we don't get is how Saban is magically able to project exactly how many such players will run amok each year so he knows how many scholarships he can afford to give out to recruits.
Give me a break. I don't like Saban very much at all, but this is the EXACT same thing that colleges do with regular admissions. Every year, a school like SMU can project that they have, say, 1,000 students graduating and 300 who will fail out or transfer (roundabout numbers that fit a trend - obviously they won't have exact numbers). They then project that, say, 25% of those who get offers of admission will come. Therefore, they will give out 5,200 offers of admission in order to exactly replace those that leave (through whatever means).
Running a football team, you can be much more exact about it, simply because there are fewer players. You have an idea of which players are going to class and which are skipping because you track that sort of thing. You know which players are on the borderline academically, which are doing fine, and which ones can't cut the butter. You know which ones can be troublemakers because you observe their behavior every day.
I'm not an experienced football coach and even I think I could get close enough to the attrition number - by pure observation - in order to know how many scholarships to offer (within 1 or 2...and if not as many leave, that's what a grayshirt is for).
This is a weak attack on a man that probably has done a lot worse than oversigned and grayshirted.