re: Armstrong would not have made the difference
Even if he had been much more eloquent (kind of like Cernan), he would not have made the difference.
By remaining quiet, he mainly aroused curiosity abut him but never was controversial. If you're more open to the public, you get more exposed to criticism.
Sometimes I wonder if the whole Apollo Program wasn't some kind of lottery and he was the winner with lots of unintended consequences:
sometimes guilt (he's the First One after all), fame, "owing something to the public", responsability for the future , etc...