One piece flow doesn't mean the same person does everything. It could mean that multiple people do their specialty, but instead of working at their own pace wit

One piece flow doesn't mean the same person does everything. It could mean that multiple people do their specialty, but instead of working at their own pace with storage between them, one passes their work product directly into the hands of the next when the next one is free. I have done the experiment with the envelopes that way too with similar results.