Everyone know about the academics of Cal Berkeley & Stanford, but Washington is huge in that department as well.........
#59 in US News for undergrads (Purdue: 49, IU: 68) is good, not great, but graduate schools stats are out of sight.
US News Global rankings, which emphasizes research, has UW at #5 (Stanford: 3; Cal: 4) in the world. For comparison, Michigan is at 19, NW at 24. UW had 16246 grad students in '21, a huge #. Total enrollment was 49000+. So it fits the BT norm of a huge, public research U. In fact, UW is in the top 5 nationally of all US Us, public & private, in fed research $.
My son lives in the Seattle area. I've visited several times. UW is a big presence there. They average in the mid 60000s in football attendance, and have a great football stadium.
For these reasons, Washington would be my favorite BT addition out of the Stanford, Cal, Oregon, Washington foursome. I'd rank it second in the PAC 12 overall, behind only USC, in overall attractiveness as a potential BT member.
Oregon is more of a flash in the pan v. Washington, but I'd pair Oregon with Washington as my favorites. Public v. Private (Stanford) and much better fan support (Cal). The academics are just ok (think of Missouri or Kansas) but the Washington-Oregon rivalry is a good one. As far as the academics go, adding USC, UCLA & Washington would be enough street cred to permit an Oregon to come in.