Potential Non Tender Acquisitions

The marlins have non tendered Jacob stallings and the cardinals have non tendered Andrew knizer. They are both experienced catchers that should come fairly cheap. How do we feel about either of them backing up Diaz? Brewers Rowdy Tellez to spell Abreu at first base and rotate with Yordan at DH could be interesting as well. The Brewers also non tendered Brandon woodruff who could be an interesting rotation spot starter or middle relief guy. Anybody see any other interesting candidates?