The thing with Sean riding Kate to the end game is Sean's win in season two LITERALLY comes from him doing the exact same thing and then ultimately taking out the probable winner (Anthony) at final 3. It's worked once for him, so why not again?
I think Scott has DEFINITELY over stayed his game welcome so, I'm not too upset with his ultimate departure. Final eight with no pairs left honestly sounds like a DREAM to me. Couldn't have asked for a better set up.
Isn't that the whole point of having a BvW season though?