I was relieved when Chloe declined to continue with the plan, which seems crazy -- drug Lucifer, then perform an exorcism? How do you exorcise the Devil out of the Devil?
It's called banishment, when you dispel the Devil from Earthly realm. Exorcism only makes him giggle, and when they refuse to listen, maybe a bit angry. At least this version. But I do wonder about the little potion, and constant reminders on the events that leads down the certain road.
I hate that Chloe appears to be brain washed by the faux priest. She said: "Most of the stuff I read was way off." To me, it read like propaganda. Thing is that all we know is that this version is very different than the one priests and religious texts has been painting.
Another thing we know is that she's a special person, and if God was involved, she's a special creation. Chloe even said to the faux priest, "Being around him doesn't seem to make him to person," in his book. Yet, he seemed to have all the answers. Even to the ones he could have possibly known, if he's just a human.
Maybe the strangest thing is that Chloe shouted: "No," when the explosion engulfed the devil. It was as if she didn't really wanted him to go away. Later on she popped the question and she couldn't believe the answer: "The Devil is only vulnerable when she's close to him."
But that's the thing. Daddy's creation, and in that equation, Chloe is human, while the Faux Priest knows too much.
Maybe the biggest surprise is that Amenadiel is now a daddy. The only problem is that last time they did something like that, there was biblical flood, when the God got angry on the babies they were making. Hence the fallen angels were cast to hell and the last civilisation wiped out.