User blog comment:Calvincambridge30/Versus/@comment-26855072-20160102193402/@comment-3423279-20160111000217

Lucifer killed Gabriel with an Archangel blade, not with his own power.

I don't think that the power difference between the four Archangels is like Heaven and Earth between the older and younger two, or else Lucifer would've just snapped his fingers and kill Gabriel when he announced that he wasn't going to help his brother.