As a buckeye fan, I can't find any issue with Oklahoma at 4, but it does seem strange that OSU was 6 behind Georgia at 5, when the committee said there was no significant difference between the 3 teams such that things like conference championships could be ignored. If that is the case, then OSU should have been 5 with Georgia 6.
This is the real problem with the committee, there is no consistency at all. Sometimes they look at the losses, but sometimes it is the wins. Sometimes they look for the most deserving and other times they look for the best. They follow the rules when they want to but not other times. It seems like the only way to truly get a fair result is to just make the playoffs 8 with the power 5 champions all getting an auto-bid, the best lesser 5 champion getting a bid, and then the 2 next best teams. So this year that would be Alabama v. Washington, Clemson v. Central Florida, Notre Dame v. Ohio State, Oklahoma v. Georgia (based on final rankings). Pretty clean this year, but even last year it would have been alright with Clemson v. Central Florida, Oklahoma v. Southern Cal, Georgia v. Wisconsin, Alabama v. Ohio State.