I agree with you. I've also speculated that the U.S. had no intention of invading Japan anyway -- since it wasn't necessary to do so to win the war.
They had a plan. Called Cornet.
The build up had started, but wasn't complete, when the bomb was dropped.
Talks of the planned invasion. I will dig up more after lunch.
"I've also speculated that the U.S. had no intention of invading Japan anyway"
If that's true, my grandfather sure wasn't let in on the secret. He and the men he served with were prepared to invade Japan, but were certain they would never see their families again. They were steeled for battle, but terrified that they were facing the end.
'Til the day he died, he hated anything that had to do with Japan.