The reason, mainly: Scioscia needs Iannetta's arm in the game, to guard against the Royals' assortment of game-changing stolen-base threats. The Angels' backup catcher is Hank Conger, who's more athletic behind the plate, but he doesn't have as strong of a throwing arm.
"With Chris, it's a little more sensitive situation right now with his ability to hopefully contain a running game," Scioscia said. " ... We felt we could hopefully move him around and get a run in, and keep him in the game, especially with the score tied. If you're down a run, you're probably going to look at it a little different."
Against anybody else, though, there's probably no hesitation from Scioscia in either scenario.
Alden Gonzalez is a reporter for MLB.com. Read his blog, Gonzo and "The Show", and follow him on Twitter @Alden_Gonzalez. This story was not subject to the approval of Major League Baseball or its clubs.