So I have finished my first three impact sessions as part of certification, and at least so far, I can say that the written descriptions provided only a few clues for me to determine someone’s motivational flow. However, the interview process was extremely helpful in providing the clarity I needed. To prepare, I wrote down some key questions about each story. By the end of the interview, I had a much higher degree of confidence that my flow hypothesis was correct.
So if others are going through the certification course are having the same fear and stumble upon this thread, I guess my advice is to relax and trust the process. I know this kind of comment probably wouldn’t have helped me when I first posted my question, but it is, nonetheless, true.