Mona, last year when I dug some plants to ship, they all fell apart into single fans with their own individual roots. Others were so joined at the crown that it was extremely difficult to separate them while others simply fell apart when we were washing them. Now I list 2F when I list on the auction because I don't know whether or not they will be joined when I dig them.
Michele, I think you are on to something. The few daylilies that I have seen put out these runners were coming from underneat the crown and not attached to the crown like normal fans. Good observation.