Earlier quoted context omitted.
Does it matter? It was probably obvious to the scientists working on the bomb that other countries would get it too sooner or later, including countries at odds with each other.
I don't know. Could Hirohito (Suzuki, etc.) have been convinced by bombs dropped elsewhere? (our physicists were able to back-of-the-envelope; should their physicists have needed hundreds of thousands of civilian deaths to calculate what an A-bomb could do?) So I think it's not obvious (multiple books have been written on the subject) what could or should have been done or not done back then; now, from my point of vi…
Not likely, Tokyo was firebombed to ashes and it didn't move him to surrender.