Theo Epstein and the Chicago Cubs are making sure that their rebuilding plan centerpiece will be playing at Wrigley Field for the foreseeable future as they try to extend Starlin Castro. The Cubs have been working on a long-term deal with Castro which could amount to six or seven years, according David Kaplan of Comcast SportsNet Chicago. Kaplan writes that the extension—which could be finalized by the end of the 2012 season—is expected to buyout his remaining arbitration years as well as at least two years of free agency. Chicago has worked tirelessly this season to find out what their ...