I hate people who play games, though I understand why they do. From what I have read there are capable alternatives to TA. If the powers that be had balls, they would preempt any move by TA and severe the relationship.
The fact that he has allowed the doubt and uncertainty to go on this long means that he IS playing games. He is certainly entertaining the notion of leaving.
If they pre-emptivey cut Trev, the University owes Trev. If Trev leaves, Trev owes the University.