You need to have someone sit down and explain to you the diference between a carrier and an escort carrier.
NOBODY was going to invade Japan after Okinawa
By "NOBODY", do perhaps mean, "MacArthur"? The troops and supplies wee already underway, dear. Your statement is patently absurd.
I mean, try looking at Japan on Google Earth and come back to me with how many fields of grain you can find. Japan was totally dependent on the sea and its access to the sea had been cut off and all of their large ships destroyed.
Japn fed itself prior to 1860 without any foreign trade whatsoever.
If they'd really wanted to go on fighting after September 45 it would have been little fishing boats versus bearcats. Who do you really think would win a bearcat vs fishing boat fight??
No one is saying we would not have won. What you don't seem to want to acknowledge is that Japan was not going to go without an extremely bloody fight that would have dwarfed Okinawa - unless we used the game-changer the we developed in the mountains of east Tennessee, the Snake River Valley of Washington State, and the deserts of New Mexico.
No American government would ever survive any sort of a scene involving a million war casualties and Truman knew that. Whatever plans might have been in the works prior to Okinawa had already been stopped BY Okinawa.
Again as I read it it was unnecessary. The Japanese were looking for some sort of a way to surrender and all Truman had to do was tell them that the war was over, and to call when they got hungry enough to want Americans to land and distribute food.