He's 36, so he very well might be running out of gas, but his big league career as a whole strongly suggest at least for the near-term would definitely be better than the others. The fact is though, his numbers before 6 of his last 7 games (all but one in June) were excellent, with only one bad performance in 19 from March to the end of May. Effective lefties are rare commodities, it's certainly worth exploring a potentially low-cost/low-risk option, the evidence suggests he may only be going through a short-term bump in the road. If it does or doesn't work out, he's easily removed from the roster with little lost and quite possibly, something gained. Also, it never hurts to have another veteran out there to help mentor the young arms.