Some good info here too. One scenario that could play out, Nats and braves tie for the division lead. They would have a one game playoff, where the loser has to use their second best pitcher in their playoff game against the wild card team with a potentially inferior record. And then has to start the playoff series with their third pitcher. Funny if they end up playing each other in a one game playoff and then the divisional series. I guess they'd be playing do or die games all week, so they could be on their fifth starter by the wild card game. Imagine having the guy not good enough to make our team starting our one game playof!
The problem with your theory is it ignores the fact that the play-in game is right after game 162 so as much as you'd love to use your ace, your basically stuck with whoever is next in your rotation -- or maybe the one guy after that on short rest.