I don't think the decision to let Nunez go is related to this flyer at all. This is merely a low-cost, no-risk flyer IMO. Nunez was gone before Elias even knew Shaw would be placed on waivers by the Giants, so there is no reason to think the plan was to release Nunez and replace him in the lineup with Shaw. As you said, Shaw is left-handed, has an option, and is cheap. I don't think it is any more complicated than that. There's a good chance IMO that, as other moves are made, Shaw ends up DFA and we try to pass him thru waivers and outright him to Norfolk.