I wandered past this thread a few times before entering the weeds. A few points.
1) I'm at odds over the premise that if Oklahoma wins out, they should get in over OSU. Head to head matters, but I believe Oklahoma was top ten when they beat OSU at home, while they lost to a (then) unranked ISU at home. If both teams win out, losing to a still top ten Oklahoma might be more favorable than losing to a top 25 or possibly ranked ISU team.
2) I've heard from a few that the Iowa loss could hold them down. Remember, Iowa could possibly be in the position to beat 2 top 5 teams as well and end up with a better season than ISU. I'll tip my cap for what's been accomplished, but a lot can happen in 4 weeks. '02 should have taught us something.
That said, I don't blame ISU fans whatsoever for being enthusiastic about the season to this point.