Turnover is an annual tradition in college football, but with that, teams' strengths and weaknesses constantly shift, too. Today, we'll continue our look at the biggest strengths and weaknesses for each Big 12 team.

Next up: TCU.

Strongest position: Secondary

Allow me to apologize to the Frogs' running backs, who were narrowly edged out by this solid unit that helped TCU navigate a rocky first season in the Big 12 but emerge with the league's No. 1 defense and seven wins. TCU's secondary was the best in the Big 12 last season and returns all five starters in the 4-2-5 scheme under Gary Patterson. Chad Glasgow returned to coach safeties and had three great ones in Sam Carter, Elisha Olabode and Chris Hackett. TCU gave up just 32 passes longer than 20 yards last season, tied with Kansas State and Texas Tech for the fewest in the Big 12. Those three are a big reason why, and though all three are solid players, it was clear that TCU's best overall player in the secondary was a corner.

Jason Verrett was the Big 12's best shutdown corner a season ago, breaking up 16 passes and intercepting six more, both the most in the Big 12. Kevin White, Deante Gray and Keivon Gamble offer solid depth at the position, too. TCU defended (PBUs or interceptions) 86 passes last season, which was 15 more than any team in the Big 12. The secondary is the biggest strength of what should be the Big 12's best defense yet again in 2013, and if the Frogs win a Big 12 title in just their second year in the league, the secondary will be a huge reason why.

Weakest position: Offensive line

Let me preface this by saying TCU doesn't have a glaring weakness next season if Casey Pachall returns and is anything close to his form from 2011 and early 2012. Still, I'm going with a rebuilt offensive line ahead of an average set of defensive tackles for the Frogs. Guard Blaize Foltz and center James Fry exhausted their eligibility (and opposing defensive lines), but the Frogs will have to find replacements for a line that was just OK last year, and had to deal with losing the team's top three running backs for some period of time after the season. Trevone Boykin's youth and sometimes frustrating indecision was a factor, but the Frogs gave up 29 sacks last season, four more than any team in the Big 12. It also averaged just 3.86 yards per carry, the lowest number in the Big 12. Like I mentioned before, injuries had something to do with it, but the offensive line has a lot to prove in 2013.

More Weak and Strong.