You didn’t, but most people who argue that KJF isn’t possible do.
You have Japan, Okinawa, Philippines, Wake within transport range, realistically, with Japan on J1 and J2. 50% of your capitol ships are 3 turns away from the American fleet, assuming one or both are not destroyed. Another 25% might be forced to move 2 turns away to recover fighters.
Japan’s going to face 17 Ground forces assuming China died (J1) on J2. That’s not including planes or tanks that might “visit” for a while.
Meanwhile, you have, on the conservative side, 5 of your original 7 mainland units left + 4 you transported. 11. Not very inspiring.
Each round you will transport 4-6 units (you’re pretty limited having transported the lion’s share of what you have in J1, not much left in J2. Fill the transports, but after that, you have to build ground forces or venture out of safe waters to collect stragglers.) The allies, on the other hand, are building in secure locations. You put in 6, the allies put in 6 + 3 - 5 warships. You put in 6, the allies put in 5 (no russians) and 3-5 warships.
Eventually you’re going to get chocked off.
Japan’s only hope is to be conservative and hope Germany cracks Moscow before Japan is limited to Tokyo.