Your assumptions seem valid however each stutterer is unique. Their stuttering was caused by different reasons and they might stutter in a slightly different manner Your example of a stutterer who had a particularly good day of total fluency with no blocks or hesitation and attributes it to luck, though he has not paid attention to his is speech until he realized he's spoken without stuttering, he's fearful because of past bad experience. My stuttering ended before I even realized it had happened. One evening while speaking with a nice I realized I wasn't stuttering. The next day I wasn't stuttering either. Though I had no idea how many days I'd been fluent, I was fluent on all subsequent days. It was gradually that I stopped worrying if I’d block, have repetitions, or have facial grimaces. I believe the realization that I had spoken without stuttering, prevented my anxiety about speaking. I believe I stopped stuttering days before I realized it. After I recognized it, I realized it was happening and I stopped anticipating that I would stutter. With success, I had no anxiety about speaking. It was a feedback loop. Realizing I had been recently fluent led to successive fluency until I no longer anticipated I'd stutter. My ‘cure’ involved psychotherapy and dealing with the anger and resentment caused by an abusive childhood. Everyone’s cause of dysfluency is unique. Some causes are even physical. Mine was emotional and openly dealing with the trauma freed my soul and I finally. found my voice at the age of 70. Yes that's old but better late than never.