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C has to be the most demanding position on the team. How does it hurt to have 3 legit C's rotating through C/DH? In case of injury, you're covered. Also, if fewer innings behind the plate=better health, does it not make sense to protect the health of the cornerstone players in Montero and Zunino (possibly Jaso, who I quite like)?
Montero, Jaso, and Martin/Napoli could handle sharing DH and C. And they may not really have to, depending on injuries. And I like the idea of players earning more AB's. It always seems to work for those befuddlingly competetive A's, who added yet another OFer this offseason!
Both Martin and Naps are familiar with the AL, and could take the pressure off both our young cornerstone C's.
I like it ;-)