I have never grown a plant from seed and thus have no seedlings. I guess I am totally confused about the grafting usage/benefits. Since the scion was grafted to a rooted cutting, I would think that taking this grafted plant, cutting it perhaps 6-8" below the graft site, and then rooting this cutting would still give me all the benefits of the root stock. This certainly is time consuming but carries little risk. I have great success with rooting cuttings of all my plumeria plants, some just take longer than others. Air-layering my old, large fiddleleaf is far more difficult than rooting plumeria cuttings, at least in my hands.
I am sorry to be such a nuisance about this, Hetty, I just want to understand. Ken