If you take all of the theories and kind of mix them into one, you get “The Orange Juice Theory.”
During the breakfast scene, just before David reveals to his son that he is the one on the front page of the newspaper, Joseph pours absolutely pure ORANGE juice into a GLASS. The camera then stays on a shot of just the glass for about three seconds.
Staying with the various color and glass themes throughout the film and with a bit of foreshadowing, we could assume that…
Now I completely understand that Elijah is not “pure evil.” After all, his main goal is to help humanity, however twisted his methods may be. But it does give you something to think about.