i dont like the idea that another author, Brandon Sanderson, continued Rober Jordan's work and decided complete the series...for all we know, the original message could have been distorted toward the end...

The Black Ajah seems to be a representation of a secret faction within secret societies that rule this world, and how perhaps they might really be running things...whats also interesting is that in the book, the Tar Valon witches wont even talk about the black Ajah.