As for Jadis being a descendent of Lillith, how soon we forget! How did the first humans come into Narnia? They weren't CREATED there but became an integral part of that world throughout its entire history.
Are we to assume that in the entire history of all possible Existance-worlds, only Uncle Andrew ever discovered how to go from one to another deliberately?
I'm quite comfortable with the idea that other beings experimenting with magic found their way to the World Between Worlds. After all, what would the purpose of such a place be except as an interface for intelligent life to journey from Existance-world to Existance-world, a term I coined to separate the notion of space travel (e.g. Star Trek) from tranferring from one plane of existance (e.g. polydimensional "Brane") to another.
Are we to assume that in the entire history of all possible Existance-worlds, only Uncle Andrew ever discovered how to go from one to another deliberately?
I'm quite comfortable with the idea that other beings experimenting with magic found their way to the World Between Worlds. After all, what would the purpose of such a place be except as an interface for intelligent life to journey from Existance-world to Existance-world, a term I coined to separate the notion of space travel (e.g. Star Trek) from tranferring from one plane of existance (e.g. polydimensional "Brane") to another.