"You can only summon an archangel with an archangel's feather." That was some very specific lore that likely wasn't much good to anyone, given that - to Lucifer's knowledge - he was the only archangel left standing. Or left sitting in a cage, as the case might be.

The whole thing had certainly made him think though. Remembering something with Raphael and his vessel. Minor detail, suddenly becoming so much more relevant. Naturally, he saw no need to let Aleister know. "Stop by again some time. You know, before you get usurped. I worry about you, baby girl. Take care of you for me, will you? Don't let those nasty demons pull your pigtails."