Martin needs no rest in the post season, there is a day off for every series and off days between them not to mention he's about to get 4 months off. You still need a backup catcher though and Navarro is certainly the best choice. For the ALDS I would leave Buehrle off the roster, that's a wasted bench spot for late inning speed like Pompey or another back up infielder in Kawasaki when they pinch for Pennington and Goins with Smoak/Colabello or Navarro.