Normally, shifting a fourth player into the outfield would help in a spacious ballpark like Kauffman Stadium. It wouldn’t benefit the KC Royals as much as you think, though.
I was reading an ESPN article a few days ago. Senior Writer David Schoenfield set the scene: The Tampa Bay Rays used a four-man outfield two times against Atlanta Braves switch-hitter Ozzie Albies in spring training. Second baseman Mike Brosseau shifted to right field for both at-bats, and both ended in outs (one lineout, one strikeout). Mission accomplished. The Rays are taking it seriously, though.