a university "silently" scrubbing someone is most times due to there being something which could cause heavy reputational damage to tangentially related to that person (or secret orders/pressure from courts or other agencies)
for example someone gets caught doing something bad by the university but not yet outright criminal, the university puts the on leave and investigates further maybe informs police or FBI too, which then start investigation but not yet without any public actions. The person knows when put on leave that they likely will find more things and disappears themself (issue with that story is the woman at on of the houses and her being let go by the FBI and coming back with a lawyer and her being not identified as his wife, which just doesn't fit in at all)
does not necessary predate FBI involvement,
a university "silently" scrubbing someone is most times due to there being something which could cause heavy reputational damage to tangentially related to that person (or secret orders/pressure from courts or other agencies)
for example someone gets caught doing something bad by the university but not yet outright criminal, the university puts the on leave and investigates further maybe informs police or FBI too, which then start investigation but not yet without any public actions. The person knows when put on leave that they likely will find more things and disappears themself (issue with that story is the woman at on of the houses and her being let go by the FBI and coming back with a lawyer and her being not identified as his wife, which just doesn't fit in at all)