Notre Dame should go ahead of OU if it were to come down to those two for the #4 slot. I don't think OU is competitive for that slot at all. Those losses to K-State and Iowa State to start Big 12 play didn't go away.
Now, if winning your conference were a prerequisite, I'd argue that OU should get in ahead of Oregon. But it's not, so the point is moot.
Tulsa's playing Cincy tough.