The above are not necessarily the correct facts of the situation. First of all, the rationale for using the atomic bomb was that Japan would not surrender. This is not the whole story.
Japan was due to surrender because they were not successful in repelling the US. It was Truman's propaganda that was trotted out in order to use the bomb. Even if Japan had said they wouldn't surrender, they would have had to eventually without the use of the bomb.

The 80,000 figure listed above sounds like a false estimate. How would anyone know this?
It has to be speculated not factual.

Timelines are easily constructed without regard for the truth.

Stringsinger.