He's never had trust in his OL. He's barely had trust in his WRs. Seems like about the only thing he trusts is his legs, so at the tiniest sign of trouble, even when it might be premature and trouble may really not be there, he scrambles. His mindset got molded into a skiddish rabbit.
He's shown a few positive signs in the pocket when it's been there. Now he needs to stick with it. Honestly I'm not sure how great of a teacher Beck is for him, but they really need to just work on those things. But again, it's hard to when you have no OL and hardly anybody that can get open