Since you've done such a great job of speculating, I give you a
gift...a preview of something.
There's an upcoming episode with Delenn going to the Grey Council.
As she joins the circle, in her Grey Council robes, she says, "In Valen's
name, I take the place that has been prepared for me. I am Grey; I stand
between the candle, and the star. We are Grey; we stand between the
Darkness, and the Light."