You do realize that they are already trusting Mountcastle to be the primary, a player who missed significant time last year from a bout with Vertigo, and they're probably not sure what even caused it.
So... the O's are going to go into a year in which they want to take the next step towards a title, and they would have the backup 1B as either a RF who has played 12 games at 1B, a 3B who hasn't even cracked the majors, and a OF prospect who has never played the position? Sounds perfectly fine to me.