You're telling me they didn't even discuss the possibility until then? I didn't know sources were so exhaustive.
Of course, they tried to grab as much territory as possible.
Regardless of how long it took them to confirm (which really has no bearing on my point since it was confirmed before the surrender), it would have taken an invasion or nukes to make them surrender. They weren't surrendering from firebombings, unfortunately for everyone.
Look, nukes are totally within forum rules to discuss, unlike the other things you seem to be mentioning to try and get this thread closed.
Operation Downfall was not some pipe dream or something that was never going to happen like Operation Unthinkable. It was planned for, soldiers were slotted for invasion. They even made enough Purple Heart medals (the medal the US awards for being wounded or killed in action) that to this day the US hasn't manufactured any more. We still had 120,000 in stock in 2003. That's how high the casualty estimates went.
What we are discussing here are the possibilities the Allies were faced with in 1945. Nukes were one, invasion was another. The Japanese showed no signs of surrender previous to this. Both actions were justified, and horrible at the same time. Either one was necessary to end the war. Downfall would have resulted in far greater loss of life and devastation, and the effects would have been much further reaching. What OP is asking for are our thoughts on the matter, and how the operation would have gone. That is completely within the bounds of discussion here, as are the alternatives to the operation as per the forum rules.
I'm sorry the Japanese got nuked. WWII sucked for everyone involved. However, not discussing the war and the decisions that were made simply because they were hard decisions, decisions that resulted in destruction, is how we lose our history as a human race, and how we cease to understand how the world works.
Sure, they provided pressure, but I've heard people (Soviet stronk-types) argue that the invasion of Manchuria was the reason for Japanese surrender. I was mostly trying to preempt that nonsense. Also, they did confirm the nuclear attack and that the Americans were telling the truth (that it was one bomb) a couple days after Hiroshima IIRC.