Josh,
The Sun Belt has the #7 RPI. It has not had the #5 RPI in nearly two weeks. It entered the Sun Belt tournament as having the #6 RPI, holding a slim lead over the Big East. CUSA is pulling away in the #5 spot.
WKU had an RPI rank of 39 entering today's game. They will fall further after today. We will see after today's action, but probably somewhere in the #42 - #44 range.
While there is an outside chance they get in ... and it will depend on the # of stolen bids, I think they are out. T6th place finish, 6-9 over their last 15, 0-2 in the conference tournament (meaning finishing 8th in the Sun Belt), and now a borderline RPI (which was their strongest argument) ... does not look good.
I will perform a much more exhaustive analysis on Sunday when I can evaluate all of their competition for the last spots in the field of 64.
Brian