I see! Thank you for the detailed explanations.
Regarding point 1: The posterior percentages are shown to 5 decimal places, so I wrongly assumed that 1.0 db meant exactly 1.
What do you think of showing the sum of the decibels of all pieces of evidence? That would have prevented my confusion.
You could also include 2 digits after the decimal for quantities smaller than 1.1. (Although this has the cost of introducing clutter.)
It comes from the people who worked with him. Even great minds like Teller, who you mentioned, held him in awe:
https://en.wikipedia.org/wiki/John_von_Neumann
To my knowledge, no one else in history has had such a large impact over so many fields (mathematics, physics, computer science, engineering, statistics, game theory, economics). If he had been an economist and nothing more he would still be famous.
https://en.wikipedia.org/wiki/John_von_Neumann