Is it really that easy? Colville Reservation has a huge section of the southern part of the county, one that makes it perhaps difficult to keep whole while also keeping to compactness rules.
linkKeeps all of Colville in 5.
Btw, I'm aware of the lack of road contiguity with that little bit of WA-08. The rules favor county integrity over road contiguity. Of course, discontiguous counties are treated a bit differently - all the discontigous chunks are treated separately. But King is not such a county.
I'm actually shocked you didn't bring it up earlier.
I mean, King is functionally discontinuous--keeping Skykomish in 8 is basically sacrificing logic to The Rules.