Why eight excellent destroyers still leave a coverage gap

Japan fields eight large Aegis destroyers across the Kongo, Atago, and Maya classes. The older Six-Six Fleet logic aimed to guarantee four available ships from six, while eight modern hulls may still yield only four at a time. Maya's two Phalanx mounts, decoys, and efficient power system illustrate how much capability Japan packs into each unit. High individual quality cannot replace the hulls needed to cover a wide maritime theater when maintenance or accidents remove ships from service. The same arithmetic makes pairs of aviation-capable ships fragile.