5. Texas Tech
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The Texas Tech Raiders had the best offense in the country in 2015 as they set school records in points scored and yards gained. This was mostly because of quarterback Patrick Mahomes, who should be a top player in the Big 12 once again, but they must replace star receiver Jakeem Grant and top rusher DeAndre Washington.
With a dominant offense, you hope your defense is just as good, but that was the complete opposite for this team. They were last in the conference by allowing nearly 280 rushing yards per game and gave up a school record-worst 43.6 points per game.