18-inch gun blast and close-range AA placement

Does the hypothetical 18-inch battleship have room for more close-range AA?

There is apparent deck space, but main-gun blast constrains its use; the exchange leaves simultaneous firing requirements disputed.

The hypothetical battleship appears to have spare room for additional close-range anti-aircraft guns. Blast from its 18-inch main battery limits how that space could be used. Another participant questions how often the main guns and AA would need to fire together, leaving the proposed arrangement disputed.