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Here are the unsung heroes in the Big 12 during Week 5.

Defensive end Nick Kron, Iowa State: The sophomore wasn’t dominant nor did he have eye-popping numbers. Yet he recovered two fumbles in the Cyclones’ 38-21 win over Tulsa. He was consistently around the football and ready to pounce when Golden Hurricane quarterback Cody Green got sloppy with his ball handling on Thursday night. Kron added one tackle and one tackle for loss as ISU secured its first win of the season.

Linebacker Marcus Mallet, TCU: Teammate Sam Carter grabbed the headlines with his two interceptions but Mallet was a beast in the middle of the Horned Frogs’ defense. The junior had 10 tackles including four tackles for loss, one sack and one fumble forced in TCU’s 48-17 win over SMU. If Mallet is a consistent, productive player in the middle for the Horned Frogs, they should be one of the Big 12's top defenses.

Running back Charles Sims, West Virginia: The Houston transfer was overshadowed by the gutsy performance from quarterback Clint Trickett but led the Mountaineers with 157 all-purpose yards. Sims had 82 receiving yards, 60 rushing yards and 15 kick return yards in WVU’s 31-20 win over Oklahoma State. Sims averaged 6.17 yards per touch on offense. He's been the Mountaineers most consistent and explosive offensive player this season.

Safety Shamiel Gary, Oklahoma State: The Cowboys safety has looked like a different player this season. He’s been solid in OSU’s secondary and made several key open field tackles against WVU to keep the Pokes in the game. The senior finished with nine tackles, one tackle for loss and one pass breakup. Improved safety play is critical for the Cowboys as they look to rebound against Kansas State this weekend and insert themselves back into the Big 12 title hunt.

Defensive end Geneo Grissom, Oklahoma: The most overlooked starting defensive lineman on the Sooners’ squad, Grissom has been solid throughout the season. He lead OU defensive linemen with six tackles including 0.5 tackles for loss in OU’s 35-21 win over Notre Dame. Grissom has joined Charles Tapper and Jordan Phillips to give the Sooners a much improved defensive front in 2013. Now that they have gained respect, it will be critical for Grissom and company to continue to improve throughout the season if OU wants to make a BCS bowl appearance.

Note: Baylor, Kansas, Kansas State, Texas and Texas Tech had byes in Week 5.

2012 record: 7-6
2012 Big 12 record: 4-5
Returning starters: Offense: 6; defense: 9; kicker/punter: 2

Top returners: DE Devonte Fields, CB Jason Verrett, WR Brandon Carter, S Sam Carter, S Elisha Olabode, RB Waymon James, K Jaden Oberkrom, RB B.J. Catalon

Key losses: WR Josh Boyce, LB Kenny Cain, DE Stansly Maponga, C James Fry, OG Blaize Foltz, RB Matthew Tucker, WR Skye Dawson

2012 statistical leaders (*returners)

Passing: Trevone Boykin* (2,054 yards)
Rushing: B.J. Catalon* (584 yards)
Receiving: Josh Boyce (891 yards)
Tackles: Kenny Cain (86)
Sacks: Devonte Fields* (10)
Interceptions: Jason Verrett* (6)

Spring answers

1. Offensive line getting straightened out. James Fry and Blaize Foltz were big losses on the interior of the offensive line, and replacing them was a big concern for the Frogs' quiet spring. The spring ended with senior Eric Tausch atop the depth chart at center and sophomore Jamelle Naff winning the right guard job to replace Foltz. Tausch started at left guard last season and moved over, but sophomore Joey Hunt slid up to replace him. Neither Naff nor Hunt have much experience (Hunt earned his lone career start in a loss to Iowa State), but they'll be leaned on this season.

2. New targets acquired. Josh Boyce and Skye Dawson took their talents to the next level, leaving the Frogs in search of a pair of new starters. LaDarius Brown and Brandon Carter were sure things, but strong springs helped fellow juniors Cam White and David Porter win starting jobs at receiver. There aren't many open gigs for a team returning 15 starters, but that's one that will have a big impact.

3. Mallet dropping the hammer. Junior Marcus Mallet emerged late last season and finished with five tackles for loss and a forced fumble among his 18 stops. Now, he looks like the likely candidate to replace departed Kenny Cain and a possible breakout talent on a loaded TCU defense. The 6-foot-1, 216-pounder finished atop the depth chart after a good spring.

Fall questions

1. Is Casey Pachall back to his old self? It's probably safe to operate under the assumption that Pachall will win his job back in fall camp, but beating out Trevone Boykin isn't the same as leading the Big 12 in passing efficiency, like he was last year before his DUI arrest that ended his season. You don't win a Big 12 title with average quarterback play, which brings me to my next question.

2. Can TCU really handle a Big 12 schedule? TCU was competitive last year, sure, and only had one game that it wasn't competitive in. But TCU's not trying to be competitive. It didn't come to the Big 12 to do that. It came to win, and it's proven exactly nothing in that realm just yet. Managing a difficult week-to-week schedule is one thing. Winning just about every week is another. Ask K-State's 2012 team and Oklahoma State's 2011 squad how easy that is.

3. Is the defense for real? On paper, this unit should be absolutely dominant after finishing No. 1 in the Big 12 in total defense and returning nine starters, including Big 12 Defensive Player of the Year Devonte Fields at defensive end. That sounds like Texas' defense from last year, who fell off the map and allowed more rushing yards than any team in school history. Sometimes, you just never really know. This is a new season and last year means nothing. Prove it again.