Elaine, you are dealing WITH already formed keikis, and this is completely different from what Heath is doing. Since I have never really forced keikis to form on these stems, I really don't know anything about what he is doing. Like you, I see the leafed plant form and then the roots follow.
You do know that you can grow seedlings in sphagnum moss, right? I do it all the time and have dozens right now growing in sphagnum moss. I do allow the moss to dry between watering. When these small seedlings get an adequate size, they go into a fine bark medium. I can't really explain, at least not easily, how I know when its time to transfer those seedlings. I have just done it for so long and with so many plants, I "kind of know".
