There's a much cleaner way to achieve the same 5-1 impact. Putting OR-02 in a blender to rescue a few blue precincts in Southwest Oregon just isn't worth it imo.
Not sure off the top of my head but I'm pretty sure Coos and Curry have better partisanship for D's then Umatilla. They do, but the point is to make a hard 5-1 gerry without drawing bizarrely shaped districts.
unless you plan to sink Eastern Oregon into Portland (which this map makes more convenient).
Yes.
Still not super-easy because eastern Multnomah is not actually very Democratic, but definitely more geographically convenient.