If you follow the story of the Minimoog from an article at Sound on Sound, it says the actual idea came from Gene Zumcheck, a Moog employee, who built his own portable monosynth called the Sonic 5. He showed it to Bob and the team, Bob didn't like the idea, and the rest of the team that included Hemsath put together the first Mini based on Zumcheck's Sonic 5 design. Soon afterward Moog fired Zumcheck and actually kept his schematics for the Sonic 5, made a few changes, and put out the Sonic 6 based on that.
Not to take away from Bob Moog, I love the guy, love the movie, and everything about him. These were simply the company politics and stuff from the day, these things happen.
Roland JD-800, Korg Z1, Yamaha Clavinova CLP-350, Alesis Ion, Alesis QS8.2, Kawai K3M, Arturia CS-80V, VAZ Modular, co-author of MinimogueVA and Arppe2600va.