@SuperbattleshipYamato hard to argue against any of this really. The IJN was so far gone by this point in the war that there’s not really much they could have done to salvage their situation one way or another. The bit about the allies not having many LSTs in general is something I never knew before though.
Your Guadalcanal
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Japanese I-Boats sank Yorktown, Wasp and damaged Saratoga and North Carolina, this leveled out the carrier strength in the Pacific. Had Japan been willing to risk an all-out commitment to Guadalcanal, it may have been able to shell Henderson Field into oblivion, allowing Japanese transports to proceed to Guadalcanal and put the Maines under siege. Had Japan defeated the U.S at Guadalcanal, I beleive, General Marshall and his supporters, after seeing Australia and New Zealand had adequate defense forces would have shut down the Southwest theater. Japan then could gather forces in the Central Pacific and waited for the new U.S Carrier fleet and the drive everyone expected.
Or Japan could have withdrawn to the Middle Solomons,where all of Rabaul’s aircraft could have been employed and the Army could fight from prepared defenses.
Reluctant to risk all at Guadalcanal, Japan took a series of half-measures that never to complete the job.
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It does seem the Japanese lost heart when their objectives and a victory were close.
Does seem strange from a culture that puts honour and therefore failure above all other things: suicide was an option. Perhaps succeeding too well is seen as wrong! Or did they believe after all their careful planning(Pearl and the other lightning victories) that they could not really have won so easily and that somehow things would change? Did they believe in Khama?Back to your question: I like the idea that they could capture Australia( A&A does that to you!)
At heart I am a defensive player, so I will go with my heart.
Your suggestion of cosolidating on the Solomons at Rabaul and supporting the fleet with ground based fighters makes most sense, as we know they could not replace and, therefore, rely on their superb carrier units.