I have a hard time believing Crawford really gave a chit, he is just happy its not his overpaid arse getting booted. Bailey is a kicker, so nobody really would even care what he said. So that leaves us with Dak and Witten as the two possible suspects.
Dak seemed really surprised by the move and didn't seem all that happy either. Said he has had several texts messages back and forth with Dez and that Dez was "his brother, not just in football".
So I think its pretty obvious it was Witten who was the rat that snitched out Dez.