Yeah, that's true too but I'm just saying teams usually can plan on it when there are days off. Not saying they have to anoint a 5th starter (as it seems you are alluding that I am), just saying that without a PPD, your first starter can't really go games 1 and 5. A postponement would make it possible to skip. But if you can't plan on it the first time through the rotation, you would need a bullpen game.