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/