That's what I got from Thorne's statement, and I think what you've posted is correct. If you don't own Luke and Laura, but bought the Pookling Twins, Quim's characters, etc, you should be able to use those purchases with Steph and David. I'd say give it a try... even if it somehow turns out to not work for you, DAZ has a refund policy. I wish I'd known that ahead of time, too. I had some interest in Luke and Laura, but really I bought them just to use the Pookling Twins package. Now that I know the morphs work on Steph and David (and give me older-looking characters, which is what I wanted) I'm probably not going to get much use out of the new MilTeens.