I still haven't given up on the theory that Ella is actually Azrael. Her having relatives and everything could be part of an effort to be more convincing / experience human life.
Spoiler: As for the new thing happening to Lucifer...
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It is possible that his "Devil face" was never his true scarred self but more like a mystical crown to rule over Hell and Demonkind. Someone has now stolen it, an event that prompted God to restore Lucifer's wings so he would have a chance to reclaim his Devil face.