"If everyone was fully healthy, we'd probably see the second of those. It sure feels like Chourio staying in left against the righty starter is a way to hide his balky hamstring in a corner spot, although the corner outfielders at Wrigley Field often have plenty of running to do in their own right. That does raise the question, though, of why we're not seeing Yelich play left, with Chourio slotted in as the DH instead. It feels like confirmation that Yelich, who missed a few days during September when his back flared up yet again, simply isn't available to play the field at the moment. He hasn't started there since August 27.
With Yelich locked into the DH spot, if we also assume Chourio had to be in left, then the outfield question comes down to a few things. Starting Lockridge indicates that Murphy prefers him to Perkins, even though Perkins is at least as good a defender and would have the platoon edge. It also says that the team isn't currently treating Frelick as an option in center."
https://brewerfanatic.com/news-rumors/milwaukee-brewers/brewers-nlds-game-3-lineup-raises-some-questions-hints-at-answers-to-others-r3867/