Curate, connect, and discover
Maybe Crowley finally meets God in S3 and they tell him that he was granted one question for saving the world
And Crowley simply asks why did you reject me
And God says they have never rejected him. They simply knew he deserved more than Heaven could have ever given him. So they let him go, and Satan put him on Earth, and they gave him an Angel smitten with him so he wouldn’t be lonely and always felt loved