When Texas Tech’s Taylor Potts went down and suffered a concussion, the Red Raider faithful weren’t sure what they were going to get when QB Steven Sheffield stepped in under center. Sheffield, a walk-on QB, has done nothing but impress all his doubters by throwing for 724 yards and 8 TDs in the past two weeks against Kansas State and Nebraska. Unfortunately, Texas Tech may have to dig deeper in the roster and turn to redshirt freshman Seth Doege....