The most likely scenario is A&M, Oklahoma, and Baylor tie for fourth with 11-9 records. (We have to win our last two, Oklahoma has to lose their last two, and Baylor has to beat Missouri...all very possible)
However, if Baylor loses tonight, Missouri has a chance to tie Oklahoma at 11-9 provided they beat the Aggies next Saturday.
All of this can be botched up in the unlikely chance that Colorado beats the Ags, or the Sooners beat Texas, or the Sooners beat ISU.
All that said, we have a really decent chance of finishing 4th in the Big 12, with wins over Nebraska, Baylor, Northern Iowa, and Oklahoma, and a fairly good RPI around 40. That, in a normal year, puts the Ags in the tournament. I'm going to try and be optimistic.