Hold up a minute on the number of blockers needed to block Alaska and the Aleutians.
USA needs 1 each in 8 and 9 to block Alaska.
They also need to block the 5 trns on SZ6 from getting to Aleutians:
If they don’t block 4, Japan can go 5 to 4 to 8.
If they don’t block 7, Japan can go 7 to 8.
If they don’t block 15 or 16, Japan can go 16 to 15 to 8.
That means that either the carrier or BB will need to be thrown out there if the Aleutians and Alaska are to be blocked.
Let me know if I am missing something on that.
If USA only puts 2 inf on Aleutians with the planes, Japan has a 2 in 3 shot of getting it with 1 land unit. Not saying I would always do that attack as Japan, but the average result (rounded, it was 1.89) of 1 plane 1 artillery remaining is tempting. Perhaps Japan doesn’t want to risk the 2 in 3 chance, but IMO the risk for the USA of moving only 2 guys there is greater. IMO it’s gotta be 4 land units 4 ftr 1 tac or not at all.
With the 5 blocks, it does push the attack back (if it happens at all), but Japan can do some interesting things. My favorite is an attack on Hawaii and the Philippines (If UK doesn’t sacrifice BB and USA a destroyer to block Philippines, that’s up to 7 easy blocker kills J2, with at least 2 capital ships), while destroying the blockers around Alaska. USA still has to buy max infantry US2 because you can come right back at them, but when you do the Philippines/Hawaii move (USA can’t possibly block Hawaii, Alaska, and Aleutians on US1, even with ANZAC help.), the commonwealth has to prepare for the possibility you are on your way to them while the US navy is on the bottom of the ocean.
As I described earlier, the Aleutians block/stack is the surefire way to prevent an attack on USA until J5, but it is a prime scenario for Japan to at least feint to switch gears, and that feint demands a response.
You are right on China taking care of itself if Japan goes full for US, but like I have been saying, remember that Japan needs 6 cities, and China can only be relevant to two. According to the current rules, china cannot help stack India, which means that going full navy (what I also think is UK’s best option from what I have seen) is incredibly risky.
I also was not keen on the BB sacrifice.
Not sure if I adressed everything in your post, sorry if not, I got to get to bed.