I agree because of the Tripartite Pact (Sep 27th 1940) that the axis would be all for one, and one for all w/US, if brought into the war. In my mind by time the Pacific side rolls around it would be entering the fall anyway. If we are working on aprox 6 month windows (per rd), any thing that happened in that time could be reflected in the game even in a slightly different order.
As you Flash, I think Hitler grossly under estimated the fact that we would commit more resources to the Euro side, then the Pacific. Its also worth noting that Japan thought that by destroying the bulk of the US fleet, that it could push the US out of the Pacific, maybe forcing an armistices of some kind. They also grossly under estimated our resolve (and the fact we could read their codes didn’t hurt). The comment about Japan knowing Stalin would not attack, in fear of a German reprisal is a good point, but at that time Stalin thought he was going to be part of the Tripartite pact. The fact that Japan also sought a NAP w/Russia shows how fearful they were, or they had a feeling Germany would turn on Russia at some point, or vise/versa.
I think its nearly comical that neither Germany or Japan got what they expected from the Tripartite Pact. Hitler wanted Japan to engage Russia from Manchuria (didn’t happen Japan signed NAP 6 months later). He also had a plan for a German/Japanese attack on India (bringing both power together), w/both taking tt along the way (both faltered on this plan). Much of India was was anti British, parts of its armed forces defected to the axis in N Africa. Axis control of the Indian ocean and the Suez would have cut off the Med from the east. Would have meant no aid to Russia through Persia. It would have also given Hitler a southern attack route on the Caucasus, as well as the oil that both nations desperately needed. Instead Japan chose to go after DEI and invite the US into the war, much earlier then Hitler would have wanted IMO, although as said before he thought the US focal point would be Japan. He did however fulfill his obligations and declare war on the US.
There was also a joint adventure planned later for the Vichy French Madagascar, to again gain control of the Indian ocean. The Japanese army actually sent an invasion force that it recalled because of infighting between its army/navy and a different use for those forces. The Germans I believe had sent subs to the area to aid in the takeover and was pressuring the VF government. Germany also sent a lot of tech, many of the Jap planes had German engineered engines and so on. IMO, Japan time after time fell a little short with its axis commitments, somewhat like Italy. There were talks and plans involving the original members of the Tripartite Pact, they just kept screwing each other. :-D