They are 0-1 against the RPI top 50. They have lost to the only on their schedule that is of NCAA tourney quality. Of course, it's not their fault that everyone in the Valley plus the in-state teams are having down years. I do think, though, that the endless string of weak opponents that they have played has contributed heavily to their lofty record.
I honestly think that if they lose to Butler and then lose in the MO. Valley that they COULD be in danger of not making the tourney due to their schedule. They probably would still make it, but 26-5 with no "quality wins" and a weak conference? It has happened before.