they should be in over ND. Both have 1 loss to a very good team, and Okie St beating OU is better than any win ND would have. Plus Okie St has a win over TCU (pre Boykin inury and losing Doctson) which is better than any other ND win (Temple next best?).
ND probably gets in on name over Ok St (though I thin they lose today and the point is moot). But Okie St has a better resume.