Oklahoma saw the Landry Jones Era end in unspectacular fashion on Friday night, with a 41-13 loss to ex-Big 12 rival Texas A&M. Jones is done, and the defense showed it needed some work under Mike Stoops for 2013, but that job just got a little bit tougher.
Jones is obviously the Sooners' biggest loss, but Jefferson's one of the defense's most talented members, and cornerback Aaron Colvin still has a draft decision to make. The transition to Jones' successor (Blake Bell, Drew Allen or scout team standout Trevor Knight?) gets a little rougher without an experienced receiver like Stills to smooth it over, too.
Oklahoma, though, will have a very tall order to try and restore a defense that struggled down the stretch after giving up 49 points to West Virginia and 48 to Oklahoma State, which was playing Clint Chelf, who began the season as the team's No. 3 quarterback.
Defensive tackle Jamarkus McFarland, Stacy McGee and Casey Walker are all gone, as is star defensive end David King. Safety Javon Harris, the Sooners' biggest standout in the Cotton Bowl loss, ended his career on Friday, as did cornerback Demontre Hurst.
Point is, if Oklahoma's going to fix its defense, it will have to do so without experience. That's difficult in any league, but especially so in the Big 12, where the only thing faster than the receivers is the rate at which offenses evolve and become more difficult to stop.
Expect the Sooners' spring depth chart to look a little crazy and be very fluid throughout spring practice, but without Jefferson and Stills, both sides of the ball will be moving on to 2013 without their most talented pieces.