They don't need all of Rogers, Thornburg, Fiers and Peralta performing well to be successful. Three of those four have options left. Gallardo, Estrada, and probably Narveson figure to be 3/5ths of the rotation. Fiers based on number of starts he had last year and Rogers based on lack of options figure to start in the other two spots. But if any of those guys falter, they will not hesitate to bring up Peralta, Thornburg, or Burgos, all of whom are on the 40 man. Behind them are Hellweg, Nelson and Jungmann who all could be in AAA at some point. This rotation has flexibility. Other than Gallardo, there's no need to keep a guy in the rotation for the duration if he's not doing the job. They can either send guys down, or move them to the pen. Oakland won a ton of games last year with a lot less experience heading into 2012. With this current offense, this staff should be able to keep them in contention. With a payroll of $80 million, they can deal for a starter at midseason if needed.