How can you possibly deduce that "pieces don't fit" from what we know.
If you really think it wouldn't be possible for a coaching staff to keep something like this hidden from an athletic administration then you're absolutely stupid.
A case that's not getting any public play at all, court documents that are sealed, and a coaching staff that didn't tell their bosses about any possible issues with a recruit.
Plus, do you honestly think athletic administrators and coaches sit there and say, "gosh better go check the sex offenders database today, to see if any of our guys are on it" ... people in those positions just don't think like that ya dumbass.