Thinking this through made me realize that there's a bit of a roster crunch with pitchers too. Lester, Hendricks, Q, Darvish, Chatwood, Montgomery, Smyly, Edwards, Strop, Morrow, Cishek, Duensing, Kintzler is a full pitching staff before any additions. Sure you can tell Duensing and Kintzler to get lost any time you want and that group will almost certainly have someone on the DL most of the time, but adding 3 pitchers(say, Hamels, Chavez, TBA) requires a tough choice. Smyly and Edwards are optionable, the former going to Iowa get stretched out seems like the likely choice in that scenario.