OBVIOUS to keep Baez as the Right-Side SS. Sweeney is LH'ed. And I believe capable at SS (per the scouting reports), but not spectacular.
It would seem OBVIOUS (since he's under contract next year for big money...) to keep Baez as a defensive replacement SS, RH'ed SS in a platoon with Sweeney, and as a defensive utility guy that has also played 2B and 3B (IIRC). Now there's a reason to keep his contract on the books (after trading-for and promoting Sweeney)... at least until someone PUSHES him out the door. And it will harder to do that now.
At least that's what seems obvious to me.
IMO.