He's either qualified or he's not.
Does SU have the same standards as the NCAA? I don't know. Does Admissions place a limitation on how many borderline kids that the coaches can take every year? Probably. Is he not good enough on the field for the school to take that risk? Sounds like it.
I can tell you that that the bottom 25 percent at UMass, at least, is community college level or lower. It wouldn't surprise me if SU placed a limit on how many academic risks it was willing to take in any given year. No doubt, they'll take some kids that are totally unprepared for college. I know because I've met them. But those marginal students better wind up being stars.