Have to think COL would find a way to keep Graves

ya maybe but then there isn't room for byram

I'd try and move Johnson over Graves

Keeping Toews is likely more important than keeping Graves. The latter should be there for Seattle.

Johnson is underappreciated (imo). He's not flashy but is the veteran that acts as the glue for a young back end. I think that loss would hurt more than most tend to think.

true but with the flat cap tho...

Why would any team give that much for Compher....

its him Rutherford. look what he gave for kappy

Not a huge priority for them.
Left side D becomes (in any order you prefer):
Toews
Girard
Byram

They'd probably look to trade Graves before losing him for nothing

Or offer Seattle compensation to take a different piece.
Too many variables to speculate. The team acquiring Graves then starts the dominoe effect of now protecting Graves (after acquiring him), and having to give up a D man they were planning on protecting etc etc