Fuso would join Jellicoe's battleships, the older Japanese battleships would reinforce the Channel, and the Kongos would enter Beatty's command after months of joint training.
A Japanese vice admiral could become Beatty's second in command, while culturally sensitive squadron naming and months of exercises prepare the combined force.
Kaba- and Kamikaze-class destroyers would provide escorts, while Ibuki- and Tsukuba-class armored cruisers offer support subject to fleet speed requirements.
Adding the Kongo-class battlecruisers would give Beatty a larger fast force whose 14-inch guns could put the German scouting group under pressure from the opening action.
If Scheer presses into the Grand Fleet, the combined British-Japanese force may turn Jutland from an ambiguous battle into a decisive High Seas Fleet disaster.
A lesson drawn from Tsushima could keep the combined battlecruisers out of Jellicoe's main line and free them to fire from the flank or block a German retreat.
Repeated simulations suggest that Scheer is more likely to abandon the pursuit after a bloodier run to the south than accept a decisive fleet engagement.
Keeping Fifth Battle Squadron with Jellicoe would bring its strongest gunnery ships into the fleet action before they had endured the battlecruiser fight.
In the decisive branch, Jellicoe could commit destroyer flotillas and supporting cruisers to the melee, with possible Harwich Force intervention adding pressure on the German retreat.
A Jutland that ends at close range could favour ships combining pursuit speed with heavier protection and prompt investment in facilities for larger capital ships.
In this counterfactual, former German possessions would become direct imperial acquisitions without a League mandate system, and Japan might receive more territory.
The counterfactual leaves room for completing American capital ships and retiring older British vessels, while Jellicoe's influence could favour new fast battleships.
If the war ends early enough in 1917, Russia may still overthrow the tsar without proceeding to the Bolshevik October Revolution, radically changing the postwar balance.
Japan might consider heavy naval losses acceptable in return for the gains from victory, leaving it with a different view of war from its European allies.
The Naval Aviation Bureau and its training centers appeared ready for expansion, but specialization and exacting pilot standards constrained the force they could produce.
The training section follows Japan from academy-selected pilots to NCO and enlisted aviators whose long experience made the carrier force formidable but hard to replace.
Japan's irreplaceable NCO pilot cadre stayed concentrated at the front instead of being withdrawn in sufficient numbers to train a larger successor force.
The kokutai was an integrated air group whose command chain included flying personnel, maintenance, and administration rather than a simple Western-style squadron.
Japanese carrier aircraft launched through an operational hierarchy of 18-, nine-, and three-aircraft formations that did not duplicate the administrative chain.
Akagi and Kaga made the First Carrier Division the main source of interwar Japanese carrier lessons, while its commander accumulated overlapping responsibilities.