Big 12 Insider John Helsley ranks the Big 12's defensive backfields, 1-12: •1. Kansas. Lost Aqib Talib and still rate as Big 12's best.
•2. Missouri. All-American William Moore returns along with four others with starting experience. •3. Oklahoma. New faces in critical places, yet the safeties are studs, and the new corners offer promise. •4. Texas. Not a lot of experience, but plenty of potential that should thrive under new coordinator Will Muschamp. •5. Texas A&M. Experience a plus, although coming off a minus performance. •6. Texas Tech. Past defensive problems shouldn't be tied to the secondary, where Jamar Wall and Darcel McBath are leaders. •7. Oklahoma State. Three returning starters and aggressive up-and-comers provide optimism. •8. Colorado. New corners are needed, but plenty of potential with two returning safeties. •9. Nebraska. Searching to fit pieces into new coach Bo Pelini's scheme. •10. Kansas State. Rebuilding and counting on — no surprise — jucos to help. •11. Iowa State. All four starters return... from unit that allowed 254.3 passing yards a game. •12. Baylor. Not much experience. Or promise.