We really do have to trade Salty IMO.
They just signed Ross, so Ross is here. Napoli will play 1B and cover C like they have said. Lavarnway is a prospect who's ready to contribute. Given the lack of 'quality' catchers on the market Salty is the obvious one to go.
We won't really miss him. Ross is a better defensive catcher, and Lavarnway can be a more consistent offensive weapon than Salty the K-machine.
The question for me is, do we package him with Ells for top calibre pitching return and get a guy to rival Lester and Clay for the 1 & 2 spots, or do we accept our mediocre rotation and use Salty by himself to shore up the pen? (point being that Salty won't bring a top SP unless Ells is in the deal, and even then, it might be wishful thinking)