My question is this:

If we're all "imaginary friends" and the creations of someone with a very active imagination, she has to tell us which of us is the real person and which of us are imaginary, since we don't have a host or central person who's at front most of the time.

Also, if the imaginary friends decide they don't like being imaginary, can they deport the real person and establish someone else as the new real person? According to Ms. Stubbs' theories, this has happened in our system several times. ;)