By Mark Gonzales, Tribune reporter
, Chicago Tribune reporter
| May 17, 2012
| 10:25 PM
We have a good young group of left-handers out of the pen. Matt Thornton has been great over the years, one of the best steals ever. But is it time to shop to see his value? -- Keek; Tucson, Ariz.
Not yet, unless the return is overwhelming at this point....