Since adopting its current lineup and round-robin format in 2012, only four Big 12 programs have gone into December with fewer than two conference losses: Oklahoma, Kansas State, TCU and Baylor.
The Wildcats and Sooners did it in 2012. TCU in 2014. Baylor in 2013 and 2014. Since the 2015 season, however, just two programs have pulled it off: Baylor last season and the Sooners in each of the past five seasons. (Not coincidentally, 2015 coincides with Lincoln Riley's arrival in Norman as the offensive coordinator.)
This tells us two things. One, that Oklahoma dominates the Big 12 at a level beyond any other Power Five program does in its conference this side of Clemson — but we knew that already.