First off, sorry about the blurry FlowRider image in the last post. Yipes.
Something else that shows that this section is indeed the deck 16 'bridge' - The AquaTheatre show's technician booth (circled).Noticing that the ship name is moved lower. The overhang/extension of deck16 seems to be where we see the Harmony of the Seas' name in the left hand image.
As for the reason for the deck 16 overhang/extension... there seems to be more deck/floor space between the deck 16 opening and the rear of the Wipe Out Bar on Wonder of the Seas.