A twelve-gun Hood would restart the caliber race

Could Hood have carried four triple 15-inch turrets, and what would that have changed?

It was possible, but the ship would grow and probably provoke an American twelve-gun 16-inch response.

Twelve 15-inch guns could have made Hood the world's most powerfully armed warship at completion. That battery also means more turret, ammunition, machinery, and fuel weight if speed and range are to be retained. The design therefore grows rather than gaining four guns for free. Its appearance would likely push the United States toward a twelve-gun 16-inch answer and weaken any prospect of holding capital ships to 35,000 tons.