Question marks abound on defense

NORMAN, Okla. -- Thanks to graduations and early entries into the NFL, the Sooners have several positions to fill on a defense that was already shaky in 2012. SoonerNation breaks that down and projects the rest of the 2013 defensive depth chart:

Defensive tackle: Jordan Phillips, sophomore; Quincy Russell, junior

The Texas A&M debacle showed how average the Sooners were along the defensive line. And now they have to replace their top three players at the position (four if you include David King, who started in the Cotton Bowl). Phillips has promise. He's super athletic for a defensive tackle. But is he ready to be the guy in the middle? The Sooners picked up a much-needed junior college defensive tackle in Russell, who chose OU over Nebraska. Because of OU's problems at tackle, Russell has a good chance to start the moment he steps on campus.