It's also a great development for Emily herself, a chance to grow both as a person by experiencing the complexity of Sinners and in her role, not limited to just bring joy to the Winners and staying in her "heavenly bubble".

Therefore the shot of him with the overlords was kind of the proto-type of his position with the Seven Deadly Sins. Besides that, he's meant to be mysterious until we learn more about his personality and issues as the story goes. Which now in series we are starting to see!

I think once the full story is out it'll make more sense. But yeah, it just kinda makes me chuckle when people seem to think Lucifer in the pilot was some devious evil being, he was just meant to be mysterious. But he was always tiny and goofy lol

By looking at the flashback from Season 2, it seems like Lilith never actually cared about handling the Overlords, I guess she always supported the Sinners the way they are, at the contrary to what Charlie has always believed...