In addition to adding a big middle of the order bat, the Cardinals came into the offseason needing to improve their bullpen. Both Seung-Hwan Oh and Trevor Rosenthal are free agents -- Rosenthal was released after having Tommy John surgery -- and they were the club's top two end-game arms the last two years. St. Louis signed veteran setup man Luke Gregerson to a two-year contract over the weekend, and now they're aiming much bigger. The club is among those in on former Royals and Cubs stopper Wade Davis.