Initially, there were no real documents or flight manuals. We learned from other pilots that had flown the jets and by asking questions like, “What should I do in terms of an emergency procedure if this or that happens”.
Now who do you suppose those “other pilots” where and what documentation do you suppose they were using?
Geographically separated from Frick and the others for the time being, Morgenfeld worked on aspects of the program that required little interaction with the others. One such task was the creation of documentation, and in particular the creation of the first of many iterations of a flight manual for the MiG-21.
Now how do you suppose Tom Morgenfeld, who was assigned to VX-4 prior to his tour with the 4477th, was able to write the flight manuals without access to the aircraft. Perhaps he had access somewhere else.