Article Photos: Oklahoma State football: Has J.W. Walsh brought on a QB derby in Stillwater? 19/37

Oklahoma State's James Castleman (91) knocks down Iowa State quarterback Jared Barnett (7) after pressuring him on a throw during a college football game between Oklahoma State University (OSU) and Iowa State University (ISU) at Boone Pickens Stadium in Stillwater, Okla., Saturday, Oct. 20, 2012. OSU won, 31-10. Photo by Nate Billings, The Oklahoman