Boldogs, Gothmogs and Sauron's New Clothes

[obloquy]

Additionally, I think her ability to consume light is unusual enough for us to label her an enigma instead. This ability and hunger of hers puts her at odds with Arda, and furthers the point that her presence was unsanctioned by Eru.

An interesting thought but what are you basing it on?

I don't base it on anything, other than the fact that it's not addressed by Tolkien and therefore not said to be impossible. It would seem that the only thing that prevented the spirit from doing it itself was that it no longer possessed the power to do so.