Having rewatched the Bent Shaving Pan of Jedidiah Smith, it seems as though Brian would have had to complete the Chamber of the Sacred Markers en route to the King's Storeroom. When Irish entered the Ancient Warriors, she tried the leftmost and rightmost armors before getting caught by a guard in the middle armor. Along with her screaming, a sound effect of a door went off. In comparing this sound effect with other episodes in which teams progressed to the right after completing the Ancient Warriors, it seems as though the sound effect matched those from the Comet-Embroidered Battle Flag of William the Conqueror and the Mussel Shell Armor of Apanuugpak (where the team went from the Ancient Warriors to the Chamber of the Sacred Markers), not that from the Enormous Feather of the Me Linh (where the team went from the Ancient Warriors to the King's Storeroom). For this reason, I believe that Brian would have been forced into the Chamber of the Sacred Markers instead of being allowed to directly access the King's Storeroom.