He's a vested vet, his salary was guaranteed when he played week one and the Browns are on the hook for it. It's not a lot of money anyways, vet minimum I believe.
And if you trade for him, lets say a 6th or 7th rd pick, his salary is already being paid for by the Browns and even if you get half a season of production, you could argue it's more than you would get from those picks.
He's another who I think is ready to call it a career, otherwise he'd have a job. The guy can come in and win a game, what a backup should be able to do.
I'd love Matt Moore. I'm thinking he doesn't have the desire to play anymore or something is up, otherwise he'd be signed. A guy like him, who can come in and win a game or 2, don't last long in FA.