I just happen to have been reading this past week, the Digital Antiquarian's IBM PC release overview (4 parts). This covers comparing Gates and Kildall (and includes e.g. the uncertainty of what actually happened with that "flying instead of meeting with IBM")
Here's the url to part 2 of that 4-parter, where Gary gets mentioned (also covered in parts 3 and 4): https://www.filfre.net/2012/05/the-ibm-pc-part-2/
> the uncertainty of what actually happened with that "flying instead of meeting with IBM"
There is zero uncertainty; it's well documented and the passenger in the plane is alive and well and has given interviews about it.
There is a lot of lying and disinformation about it, though.