As an exemple of this month of my games in championship division of the aa42 league (all games with no bid obv) :
with axis : 3 wins (2 Fortress Europe, 1 Moscow Blitz)
with allies : 2 wins (1 against Fortress Europe with quite good rolls for me, 1 against AC bulid in Med)
1 loss (against Fortress Europe)
Allies needs 8 transports disembarking, that is 56 IPC, plus quite a bunch of sea units on both side, if they lose a juse sea fight it will be a pain to build back mostly if they trade against Japan.
As for your question on Japan in Asia, you don’t need air to get to Moscow, past turn 1, If there is no IC in Asia.
As for Germany aggressivity, it is just the “normal” way to make an attack, build infantry first then aggressive units.
There are 3 fronts in KGF games: Asia/Russia, Germany/Russia and Africa. Fortress Europe stops allies from spreading their units as they need between Africa and G/R fronts (from around turn 5 when Japan threat to invade Africa becomes real). Yes it will likely take around 8 turns (sometimes even more!) for Japan to take Africa but when they do axis superior IPC production will become decisive.
It might seems like a very long plan, but between top level players you need good early dice to justify aggressivity or you will just get kill by a fine tuned counter-attack. To be succesful you need to be able to plan long term plans.