1. Japan would not conceed to unconditional surrender. The military cliques were running the show and preferred suicide to surrender.

You didn't read my post. I pointed out that even after Nagasaki that the Japanese STILL did not accept the demand for unconditional surrender. In the end, Truman overrode his New Deal advisors who wanted to totally destroy the imperial regime and agreed to the Japanese condition. Hence, the final surrender was NOT unconditional. Hence, Truman could have avoided both an invasion and the a bombs had he purused this option at the outset.

Naturally, the American plan considered Japanese resistance. It noted the possibility that the invasion "will be opposed not only by the available organized military forces of the Empire, but also by a fanatically hostile population", which would result in high casualties. In a study done by the United States Joint Chiefs of Staff in Apr 1945, at least 456,000 casualties were to be expected for Operation Olympic alone. Some other evaluations were also done, and their casualty estimates ranged anywhere from 30,000 to 1,000,000. In preparation, the United States manufactured 500,000 Purple Heart medals to award to those injured in combat.