Those souls would not have been saved.
Had Japan not surrendered, the Soviets were right on their doorstep, ready to invade. The citizens were armed and were told to fight. In July, just before the bombs were dropped, Tojo informed Moscow that surrender was out of the question. After the Postdam declaration was rejected by Japan, Moscow amassed their troops in China and prepared to invade Japan. Had they and the allies invaded as they planned to do, those souls, as you call them, would have died. Along with millions of other souls.
It took two bombs, the Soviets entering the war and gathered on the coast of mainland China, preparing to invade, to get them to surrender. And even then, they dragged their feet. Japan never had any intention of surrendering. Do you forget what Hirohito told the Japanese civilians on Saipan when Saipan was falling into the hands of the allies? That they should kill themselves and gain spiritual benefits for doing so, instead of surrendering or allowing themselves to be captured and held in the civilian internment camps which were created to also keep them out of combat. What about those poor souls, pjdude? Tojo allowed that order to go through and Japanese women were jumping off cliffs while clutching their babies instead of surrendering to the allies. This was the mentality of the Japanese leadership. And it was that very same mentality that saw Tojo inform Moscow that it had no intention of surrendering. Sure, they wanted peace because they knew they would not have been able to win,
but they would not surrender.