I will break it down for you, since you must not follow CFB too closely:
Big 12 -- Okie State/Baylor: Okie State wins, they'd get in over Oregon. Baylor wins, they'd get in over Oregon. So t ake your pick (this is IF the Big 12 even has a representative.
SEC -- Georgia/Alabama: Georgia could stay home and still go to the CFP. Alabama could lose to Georgia and STILL get in over Oregon because they would have WAY BETTER losses, a much tougher schedule and the same record.
Notre Dame -- ND has 1 loss to Cincy. They also just curb stomped Stanford, who beat Oregon. So not only would have they a better record, a WAY BETTER loss, and they pummeled the common opponent they have with Oregon, while Oregon lost.
Cincy -- They'd have a better record, a better win (beating ND at ND) and since ND would get in over Oregon, Cincy won the H2H with ND, so they'd get in over ND.
B1G -- Michigan/Iowa -- If Michigan lost -- they'd have losses to top 10 MSU and top 15 Iowa, so better losses and the same big win, but UM's was more dominant and at the end of the year, where OSU was LIGHT YEARS better, as Tre'veon Henderson became the starter and Stroud had experience under his belt at QB. The other common opponent is Washington, who Oregon fought tooth and nail, while Michigan hammered Washington by 3 tds while rushing for 350 yards on them.
So now you tell me how Oregon is going to get in and why?