Why multiplying each alliance's best navy still favors the Allies

What happens if every Axis country receives the Axis's best navy and every Allied country receives the Allies' best navy?

The Allies win decisively because multiplying the Royal Navy across the larger coalition produces far more total force than multiplying the Japanese Navy across the Axis.

The result depends on when the hypothetical begins and which countries count as participants. An early European-war comparison uses the Italian Navy for the Axis and the Royal Navy for the Allies, with the Dominions increasing the number of Allied copies. Once Japan is included, its navy becomes the Axis model, but the enlarged Allied side still receives more complete fleets. The Royal Navy is selected largely for its size, with British and American capabilities judged broadly comparable in this period. British designs would not fit every American Pacific requirement, yet the huge Allied numerical advantage would remain. The exercise uses rough fleet multipliers to illustrate how coalition membership can outweigh the strengths of an individual ship or class.