Ichabod and I played the experimental bright skies game where he bought bombers only for the first 3 rounds for US. The bombers definitely slowed Japan down as UK had Kwangtung and china had almost all the land from manch to fic and to the west at round 7 when the game ended.
The problem was that Germany and Italy combined to take Moscow on round 7. Italy also moved strong into nw persia round 7 with German planes ready to reinforce it on round 8. The game ended here.
Without US pressure, Germany and Italy were way too much for UK and ussr to handle. Although Japan was weakened, they still had income of 43 from islands, fic and ne ussr lands. Tokyo was under no threat to fall.
This was just one game under bright skies and the next game under these rules might be different. But, without US pressure, Germany and Italy can steam roll USSR, which is what I’ve said earlier.
Also, if I had played Ichabod under normal rules where US can apply pressure in europe, the results might have been different and he could have very well beat me as his base strategy seemed solid.