You guys are over thinking it.
This is a one time catch your opponent sleeping strategy.
They will never see it coming.
Once they have seen it and their IQ is above room Temp, don’t keep trying this strategy.
Sure there are possible variants of this strategy.
If opponent abandons Pacific, you fight like mad to hold the two Victory cities in China and beeline if for Australia.
I have won that way 6-8 times myself.
I have also, delayed declaring on Allies and that did work a couple times. In both scenarios I bought more Germ Tran and the Krauts took USA.
This is still a viable strategy, I have sprung it 10 times or so since my original post and was 7-3. Some of those victories the opponent had seen it before. The 3 losses, the opponent knew it was coming and curb stomped me.
The funniest thing, some guy named Melonnade sprung it on me.
I had been waiting for that moment. He raged when I kept the Germans pinned in Europe, said the strategy sux. I had a good laugh. EnterpriseCV6 witnessed it. When he jumped in the game he assumed I was Axis…took him a bit to realize I was not. Too funny.