Oklahoma and Oklahoma State were expected to contend for a national championship, and both are certainly on pace to do that with perfect seasons intact. The surprise in the Big 12 has been Kansas State, which also hasn’t lost.  That gives the Big 12 three of the 10 undefeated teams left in major college football.  The SEC is the only other league with more than one undefeated team: top-ranked LSU and No. 2 Alabama.  The Sooners play Texas Tech on Saturday, while Oklahoma State gets Missouri and Kansas State faces Kansas in the annual Sunflower Showdown. So it’s quite possible the trio could still be undefeated next week, when the third-ranked Sooners visit the No. 12 Wildcats.  Oklahoma and Oklahoma State don’t meet until the final week of the regular season.