That's cool about RW and KP.
I think the similarities between UW and the Seahawks end at the use of the read option. Seattle only used the read option on about 20% of their snaps last season, whereas in the BSU game I think every snap was taken out of the shotgun and most of them were read option plays. Also, despite the fact that I really wish they would, the Seahawks refuse to run no huddle (exempting the obvious end of half situations where they absolutely have to). They did it for a couple games back in 2011 and it worked very well, but it ended up being canned for some reason.
I've heard it was OL coach Tom Cable that vetoed it, but never heard his reasoning. Ever since that time, Seattle has taken the opposite tactic by milking the clock down to the final seconds before snapping the ball. So the Seahawks are pretty much the antithesis of hurry up: they want to kill as much clock as possible per play.
I would be very surprised if Sark didn't reach out to Pete for advice from time to time. It wouldn't even surprise me if Pete sought to pick from Sark's knowledge either. Both coaches have shown the ability to adapt and learn from others. In fact, I think it was almost at exactly the same time that both UW and the Seahawks began working read option into their game plans. It happened for both teams within a month or so early on during the 2012 season, and I think Sark did it first. I think for UW, he used it for the first time vs. Stanford, and for Carroll, it was the Chicago game. So without looking, maybe 6-7 weeks apart? Could, and probably is, just a coincidence, but at the very least it proves that PC and Sark are of like minds.