I don't think there's any outcome that can keep OU out of the playoff. The Big Ten championship game loser will have a recent loss, won't be a conference champion, and won't have a season with nearly the number of quality wins that the Sooners have.
Ohio State has won exactly one game against a top-25 team this year: last week against Michigan. The week before, when playing at home, Ohio State gained 5 first downs and 130 yards of total offense while being totally dominated by the Spartans. No one would pick the Buckeyes ahead of the Sooners.
If Alabama loses to Florida, the SEC will be out of the playoff. If UNC beats Clemson, the Tar Heels have a chance to get in the playoff, but that's when compared to Ohio State and Stanford. It doesn't impact the Sooners chances.
Stanford still has a puncher's chance of getting into the playoff, but that's based on winning their conference championship game combined with a loss by Bama or Clemson, or both. If the Cardinal get in, it will be as the 4th seed.
It's pretty unlikely that the playoff field will include any teams that aren't conference champions unless both the Tide and Tigers lose on Saturday, and the chances of that happening are very slim.
None of that really matters, though. The Sooners' case has been made, and that book is closed. Nobody can really move them from the top 4, and I don't think the Big Ten champion will have done enough to move OU down from 3rd to 4th.
Sooners are in, period. Root for Clemson to win tomorrow, because that all but guarantees that the Sooners will play in the Cotton Bowl on New Year's Eve.
YCN, Plaino (or anyone)
What do we want to happen this week while we're relaxing ? I've heard theories that IF iowa wins it could pave the way for tosu to ace us out depending on what the others do. (I'm not sure I buy that, and won't be pulling for the hawx)