<Snipped quote by Balance>
Does that mean we're not the first ones to talk about this, or even the only us?
Not quite. There are many, many versions of us, but those are from Path universes, and technically should not be able to get out. Evil David is an exception, but that's another story. When we from Source universes escape as Tier Fours, our choices no longer have any bearing on what Paths exist, or something like that. There aren't any Path Existences floating around--that would be weird.