Carr is the starter if heathy. Period.
The #2 backup job I see as being Bank's one last year, with Ragone in the #3 role. If Ragone progresses this year, then I think they will move him into the #2 spot next year, with Symons assuming the #3 role, IF they can keep him. I am a Symons fan, and I think the best thing that can happen is that he can be put on the PUP or IR list. If he goes to the practice squad, it is my understanding that other teams can sign him to their active roster. I can certainly see that happening, and would hate to lose him.