Actually, I think his dad will get out of jail almost immediately, and then be angry with Thayer for betraying him. Why would Alec immediately conclude that Thayer was in on his arrest? But he did, the first thing Alec said when he was arrested was directed at Thayer, "Did you know about this?"
Thayer might go back to LA just to get away from his dad's anger! And Rebecca might tell Sutton to go too, to keep an eye on Thayer, keep the twins apart, while she continues with the plan!!!