I have been very excited for Chytil's return since he unexpectedly started practicing again. And I've personally been concerned about Rempe being in the lineup and inevitably making a costly mistake, and the fact that he isn't considered trustworthy yet in late-game situations and is taken out of his regular shifts. (what happens in OT?)
But even though I've been worried Rempe's play might backfire, I like the idea of his physicality against a talented group of Hurricanes defensemen. It's a gamble, but it could make a real difference.
Chytil not getting into the lineup could be for the sake of being extra certain he's in game shape, or being more protective of his long term health. Or, the lineup may be staying the same because it's been a winning formula. Or it could be a combination of all of these reasons, and potentially others. If the formula works, the team wins, and injuries don't become a factor I feel like the lineup doesn't change.
Obviously, there's a big difference in talent level between the Hurricanes and Capitals, and even in the Hurricane's bottom-six; Laviolette matched Rempe against the fourth line on home ice, but even that would still represent a much different challenge for him than round 1.