User blog comment:B214/Question and Answers 6/@comment-9595671-20160714212150/@comment-9595671-20160715021851

I do recall hearing somewhere that an Evil Piece's ability to be accepted depends on their' master's power, I don't know if that came from canon info or not, but if it is true then having Ophis and Great Red's power may mean Issei could add her to his peerage, even if it takes a Mutation Piece or his Queen piece.

Speaking of Satan, there's one thing that's always bugged me... I'm sure the Devils must have originally came from Heaven like the Fallen Angels since usually religion has the two closely linked, they just did something more severe than the Fallen Angels did.

So... shouldn't there have only been one Satan at the start? And why was it revealed the Satans were killed when God wasn't, did everything think maybe the old Satans just retired or is the original Satan still alive but doesn't really do anything in the Devil world?