There are a couple of ways this battle plays out for the KC Royals; they both platoon, or one wins the battle in Spring Training and the other goes to the bench or the minors. For me, the best and most likely option is to platoon them.
The reason platooning is the best option is because Ryan O’Hearn is not the best hitter against lefties and McBroom, in his cup of coffee in the majors last year, hit lefties at a clip of .280/.375/.400. O’Hearn’s clip is abysmal against lefties at .144/.235/.256, which means his OPS of .