Jackson is out of options, therefore, unless they're willing to take a chance on losing him when they DFA him, they need to keep him on the active roster. If they claim a rule 5 guy, they are obligated to carry him on the active roster if they want to keep him. Maybe one of the three can play an adequate 1st base. That's the only way I can see to carry Jeffers, Jackson, and Susac, otherwise you have 2 catchers on your 4 man bench.