> the aircraft architect
because that's the guy who really built it. He could not have done it alone or without the help of everyone you mentioned, but let's not pretend like everyone was equally important here.
As a tangent, this is one of my favorite books detailing the creation of some of Skunkworks' projects, including the SR-71:
https://www.amazon.com/Skunk-Works-Personal-Memoir-Lockheed/...
[1] https://www.amazon.com/Skunk-Works-Personal-Memoir-Lockheed/...
https://www.amazon.com/Skunk-Works-Personal-Memoir-Lockheed/...
For context, this book covers history on the development of these UFOs and was written by Ben Rich, who worked at and eventually led the Lockheed division that developed these planes. If nothing else, it's a fascinating account of many historical events from a totally different vantage point.