This is a bit of a tangent, but I've always been rather mystified as to the concept of the "rebellious angel."
Man was given a soul, and with the soul comes free will.
Angels, while existing before man, did not have this free will. It was a gift of God, to men.
So then, if lacking free will, how does an angel rebel unless he is instructed to do so?
And if he was instructed to do so, does he remain evil?
But then these concepts are so confused by Hebrew and Christian politics and mythologies that I rather doubt this is how it was all first conceived.