Both Oregon and Oregon State have lost some keys players and coaches. Oregon lost Shelley, Chavez, Mikesell, and Dugalic. Dugalic seemed to have loads of potential as a 6-4 wing/forward. I remember being very impressed with her skill set while watching her high school tape. One of their bench players also retired, so they're down to eight until they add some transfers. They also lost Campbell and Lopez who become head and associate head coaches at Sacramento State. They replaced them with Jackie Nared (Arizona) and Mike Moser (Dallas Mavericks). That's a lot of talent lost, but they still have Prince, Sabally, and Pao Pao - and that's a lot of talent.
Oregon State lost Goforth and Samuel to transfer, and then Jasmine Simmons returned to Australia. They did add two transfers in Emily Codding, (St Mary's) who torched Cal a few years ago, and Tea Adams (San Diego State). They lost Brian Holsinger and Katie Faulkner who were named head coach and assistant coach at Montana and Washington. I don't believe they have named replacements yet.
If I had to guess, the top of the Pac-12 will look like:
1. Stanford
2. Arizona
3. Oregon
4. UCLA
5. Oregon State
6. Washington State
Cal may be a year away from contending for an upper half spot, but will be better than expected IMO.