Why?
Let's assume you lose to Oregon, currently ranked top among your remaining opponents. You would get wins over two teams that are currently ranked (I don't know where you're getting this mysterious 4th ranked team from, UCLA is not ranked in any poll). One of them would be California, an above-average team who plays zero defense and is coming off unsightly losses to Oregon State and UCLA. The second is USC, who has lots of talent but hasn't played well all season and lost to Stanford. Then you've got UCLA, who lost to Notre Dame and got thrashed by Utah. They're good wins, but it's not as impressive as you seem to believe.
Contrast with, say, a two-loss Florida.
Florida has losses to Auburn and LSU. Both games were nailbiters, both opponents were good, and neither loss should hurt Florida's title hopes as much as losses like those suffered by USC (Stanford) and Michigan (App State). If Florida ran the table, they would have beaten Tennessee, Kentucky, Georgia, South Carolina, Florida State, and probably LSU.
So the question is: What's more impressive? Going 3-1 against California, UCLA, USC, Oregon? Or going 6-2 against Auburn, LSU (x2), Tennessee, Kentucky, Georgia, South Carolina, and Florida State?
I think the second accomplishment is more impressive. Florida plays exactly twice as many heavyweight games as ASU. I think it's fair to allow them to suffer exactly twice as many losses and be considered comparable. I think that Auburn, LSU, Kentucky and South Carolina are better than anyone but Oregon on ASU's schedule.