Hairston has been terrible in the field at 2B in Walker's absence. A few errors in key situations and a few other plays that weren't errors but should have been handled.
Walker is not terrible against LHP, at least not any worse than Hairston has been overall. Myself, I'd still expect Walker to start at least 2 out of 3 games. Ok, lets say I hope, since I do have him in a deep league.