Colleague Ryan McGee broke down his five position groups with the most work to do this offseason, and one Big 12 team made the cut.
You'll need ESPN Insider to see the other four teams, but here's what McGee had to say about the Horned Frogs' defense, which has its work cut out for it this spring:
For seemingly forever, the Horned Frogs ranked among the nation's top passing defenses. But last year, TCU's final season in the Mountain West, they finished outside the top 12 for the first time in four years. Still, they were tough. But graduation cost them four members of that back seven and February's bizarre drug scandal tossed returning leaders Tanner Brock and Devin Johnson off the team.
And all of this just happens to coincide with TCU's arrival into the PS3 pass-happy offensive world of the Big 12. Trent Thomas and Travaras Battle are returning DB's, joined by linebacker Kenny Cain, who had 72 tackles last fall. There is also arriving spring help from early enrollee JUCO cornerback Keivon Gamble.
TCU's spring practices are all closed this year, so we'll be left to the word of coaches and players to get a real feel for how the defense is progressing with lots of new names on the field.
One thing is for certain, though: With the offenses in the Big 12, this group will face big tests almost every week in 2012.