Very well written argument! And I'm with you on the idea that Rowling has been spelling this out from the beginning. I suspect that the nature of death is going to be a major topic in the next two books. I think that was why it was so important for Sirius to fall through the Veil, as Rowling keeps insisting it was. There's something about the nature of life, death, mortality and immortality that she wants to illustrate.

Much more interesting than a story that is little more than an allegorical presentation about Nazis.