The absolute best case scenario in an invasion of Japan?

So for whatever reasons the atomic bombs are delayed by months or even a year and are not ready in time for the planned invasion of Japan.

What is the best case scenario for the US and its allies invading during the fall of 1945 as was the plan with Operation Downfall?
 
So for whatever reasons the atomic bombs are delayed by months or even a year and are not ready in time for the planned invasion of Japan.

What is the best case scenario for the US and its allies invading during the fall of 1945 as was the plan with Operation Downfall?

Best case for allies is no invasion. Sit back, continue with Starvation, and let nature take its course. Japan collapses.
 
"Emperor Hirohito's tour of the destroyed areas of Tokyo in March 1945 was the beginning of his personal involvement in the peace process, culminating in Japan's surrender six months later"
"Contribution of Major Fire Raids Toward Ending WWII" p. 38. Turner Publishing Company

Simple, japan would end surrendering anyway, the firebombs caused more damage to the japanese industry and morale than the nuclear ones, unless of course that hardline coup succeded in 1945, something that was unlikely
 
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