Wearing my cynic cap today...
Here's an example of why there are not many real answers: One group of people claims O'Sensei could dodge bullets... Another group says that's a fabrication. Both sides believe they are right, and both cite hearsay evidence. The only real fact is that whether he could or could not does not affect our training, as we are not teaching or being taught how to dodge bullets now. What is more relevant than what O'Sensei achieved is what we
can achieve. I enjoy the stories as much as anyone, but sometimes a cake is just a cake. The mythology often needs to be de-emphasized.
I think he lived for the sake of others. So in the end it is about what he left us. His goal was to forge men of utter integrity. If he could do that even once then he has achieved in his life-time something more spectacular than dodging bullets.