@TheDesertFox
If they focus everything on the pacific they will be at least 3 turns away from even being able to attack london.
Thats 3 turns of extra german income, 3 turns for italy to clear out north afrika.
This only works if the US doesnt build enough fleet and not enough forces on the european board. His whole strategy is based on the US focussing 100% of its income in japan and sending every available unit towards japan.
In that scenario you taking london will be impossible to retake in less then 3 turns.