You're mistaken. On Dec 16th in the NET it was...
32 - Marquette
40 - Xavier
47 - Creighton
100 - Providence
The Big East really did not have a great non-conf. Creighton had a losing streak, Marquette and Providence lost games to mediocre teams. Xavier lost all their high profile games.
KenPom was higher on all those teams than the NET though (31, 30, 26, 69), and higher on all compared to the polls except 4 spots lower on Marquette. The polls react strongly to big single wins (like their win over Baylor).
Butler, St. John's, and us have absolutely been advanced metrics Santa for the rest of the conference.