I think the AD is making Brian deal with this divorce and get it taken care of before it's way out of control.
I don't think you can put somebody on leave because they're getting divorced.
Won't repeat any of the details, but the rumors that were posted in the short-lived "Worrying Situation" thread were largely (if I recall) about the behavior pre-divorce.
Whatever that is, presumably it's something that the University feels either 1) gives them the ability to terminate with cause or 2) gives them the leverage to negotiate a favorable buyout because Smith/Attorney see the risk of an arbitrator deciding in favor of the University.