There are three divisions within the MWC so far this season

Looking at this Geoff Grammer tweet:

Mountain West KenPom rankings (12/11/14):

26 SDSU
59 Wyo
60 CSU
70 BSU
77 UNM
128 UNLV
137 USU
171 AFA
222 FS
225 Nev
320 SJSU

Look at the gap between New Mexico and Las Vegas and then the one between Air Force and Fresno State.