User blog comment:Rafe Adler/"Let the Good Times Roll" Discussion/@comment-31057575-20180518082315/@comment-70.93.83.195-20180518122719

The reason why God nor Amara have not been brought back is simple because they are just too powerful to keep around. If either came to help whenever there was extremely powerful Big Bads they would be able to easily depower or kill them with a snap of their fingers 99% of the time. It is the same reason why Cass has probably long since been weakened because at full power particularly after becoming a Seraph, he would generally dwarf what he and the Winchesters have gone up against. In order to give challenges and stakes in Supernatural, Sam and Dean can't always have all-powerful allies at there disposal.

If the Empty is truly being revisited next season than I hope that means we haven't seen the last of Lucifer whether he gets out of the Empty or not.