Stephen
I think it is interesting that you used pages from the book to support your statement. I was surprised at first when I saw page 205 since it is way beyond week two, but I think it would be an interesting thing to include in the debate with your students.
As far as the scientists being proud, I'm sure many of them would have been ecstatic and celebrating the successful test and, if not them than certainly the US's war hegemony, at the success of Little Boy. They were working for years on the problem (the same problem the Nazi's were unsuccessful in solving and the Nazi's invented the balistic missle, jet planes and all sorts of other things the Allies marveled at, so this would have been a major mental victory). Now did that initial feeling last is the real question. How many destructive inventors like Nobel were excited by their invention only to later feel differently?
As I stated in one of the videos on this site, the US government had changed their invasion plans to include the use of more than a dozen atomic bombs. So you are right in pointing out those pictures on 205+ that there were people who were expecting to drop multiple on Japan and possibly destroying the whole country and its army before the war would end. We know the destructive force of 2 atomic bombs, my brain refuses to truly envision what Japan and the US would have looked like after a US invasion involving 14 atomic bombs to walk US troops across Japan.