MeinHerr
Obviously much depends on the axis overall strat, and what their end game is. For an all out axis Barbarossa (meaning Germany is locked in, and Italy/Japan will both assist in some way taking down the Russians), it might be best for Japan to be more patient keeping the US at port on the Euro map.
With no J1 attack when Japan does attack would depend on the ships/transports being dangled by UK/Anz, but also on the positioning of the USA as well (considering the German rush to Moscow). I have stated that a J2 attack would be likely if the UK keeps the BB in the danger zone, and Japan was also able to sink other ships like destroyer/transports as well (not just the BB). I have given it more though though, and Japan would need to look at the whole situation (both sides of the map). If that BB was placed at Hong Kong as you have said in other posts, as Japan you have it trapped (Japanese air should be able to kill it J3 if positioned). So if they wait til J3, they probably still get the Brit BB, but you run the risk of the UK/Anz DOW before J3, but does that hurt you……
Explain: Axis have a plan (needs to be flexible). In the original scenario it’s all out def Moscow. Rus1 & 2 the Siberians are heading home (all 6 AA guns def the capital etc…). So Japan should probably start moving into Russian land as the Siberians retreat (taking away income one IPC at a time).
With no J1 attack:
Say on US1 they build on the Pac side and move in force to Hawaii (normal because they get more freedom to move on the Pac side). If you attack J2 in this case it would take the US til turn three to get to Gibraltar in force (able to purchase for E US on US2, and/or move through Panama etc…). The US navy at Hawaii would take another round to get to Europe, so maybe it comes, maybe it stays. If it stays the US has just split its navy in half, which isn’t exactly ideal for them.
Maybe US1 has the west coast fleet coming through the canal, and them building on E US (Hawaii ships come back to W US coast). In this case the US is gearing up to go heavy Europe so axis need to decide to stay with the orig plan (Japan doesn’t attack keeping US locked down), or maybe Japan goes for a Pac win instead.
There are a lot of factors to look at, and the axis will need to be flexible depending on what the allies throw at them. They might have originally planned for the Germans to go G2, and Japan to go J3/4, but things change and a J2 attack might be beneficial if they can set the allies back.