They are available, and they are definitely low-risk, high-reward guys.
I think, with the team at the stage they are in, they can afford to make these kinds of decisions.
Hafner's degraded ability to play in the field make him a bigger risk, but that bat could be resurgent in OPACY.
At the same time, Sizemore, while consistently broke, has the ability to make an impact at a high level and play the field.
I think you could use him at several positions, and he creates a low-cost hedge for McLouth and Reimold.