> Is there some small gene change that we're specifically worried about here
Yes. A single gene change allows for airborne Ebola transmission. This gene change has occurred in the Reston strain, which luckily does not cause symptoms in humans.
https://en.wikipedia.org/wiki/Reston_virus
Where does that article say Reston (or a mutant strain of Reston) is airborne?
Where does that article say Reston (or a mutant strain of Reston) is airborne?