The Giants, Reds and whoever the Braves will face are not teams that are on a down swing. They're all playing well. When you get to the playoffs, you face, who you face, avoiding a divisional opponent is sillier to me than arranging it so they don't in the NLDS. Take the one seed, let the other team use their ace, this isn't a hard decision, that's significantly more preferable than going west to face the Giants with a fresh rotation.