Per his Facebook Kiffin must have really pissed him off
His scholarship was revoked because he did not qualify for early enrollment.
He also blew out his knee at a camp he was told not to participate in (The Vol Camp), and then lied about it to the coaching staff.
He had been in the dog house for quite some time.
It was as amicable parting as possible, but with limited scholies the Trojans are being very deliberate in who they take, and are in the hunt (and in very good position) for two more 5* recruits to potentially finish out their class.