Well, no. Tokyo was already attacked before, and had significant destruction received already. And some cities of tokyo even were on the initial list of targets

Well, no. Tokyo was already attacked before, and had significant destruction received already. And some cities of tokyo even were on the initial list of targets with strategic value for the atomic bomb. If anything they did not choose it because is was not important enough. In the end they decided the target mainly by effective damage (physical as also psychological), which ruled out already attacked areas and left only a handful cities. Of those hiroshima was the best, because of size and the surrounding mountains, which made the best setup for effective demonstrating the power of the atomic bomb.