Who's gone: QB Landry Jones, S Tony Jefferson, WR Kenny Stills, S Javon Harris
Who's back: CB Aaron Colvin, RB Damien Williams, FB Trey Millard, WR Jalen Saunders, LB Corey Nelson
Why they'll win the Big 12: The Sooners' switch to an offense that utilizes a more mobile quarterback should benefit projected starter Blake Bell. And he's got a slew of offensive playmakers returning, with Williams, Millard and Brennan Clay in the backfield and Saunders and Sterling Sheperd at receiver.
Why they won't: OU struggled so much at times on defense last season that switched to a scheme that used seven defensive backs and no linebackers. That was an experiment coordinator Mike Stoops has admitted backfired. But the Sooners also lack depth on the defensive line.
Who's gone: QB Nick Florence, WR Terrance Williams
Who's back: RB Lache Seastrunk, LB Eddie Lackey, DE Chris McAlister, WR Tevin Reese, LB Bryce Hager
Why they'll win the Big 12: Art Briles recently mentioned that “tradition” is now one of Baylor's biggest strengths. Could it be? The Bears lost Heisman winner Robert Griffin III at quarterback and first-round NFL Draft pick Kendall Wright at receiver after the 2011 season and still sported one of the nation's most potent offenses in 2012. Next up at QB? Bryce Petty, who got rave reviews during the spring.
Why they won't: Even with the high praise, Petty doesn't have the game experience Florence received while stepping in for an injured Griffin in 2009. And this is a defense that ranked 119th out of 120 teams against the pass last season.
Who's gone: QB Collin Klein, LB Arthur Brown, DE Meshak Williams, CB Nigel Malone, WR Chris Harper
Who's back: S Ty Zimmerman, RB John Hubert, WR Tyler Lockett
Why they'll win the Big 12: It's hard to bet against coaching wizard Bill Snyder, no matter the circumstances. Don't forget the Wildcats were picked to finish sixth in the preseason Big 12 poll last season and became a national title contender in November.
Why they won't: The Wildcats simply lose too much talent in Klein, a Heisman finalist, and Brown, their defensive leader.