It’s interesting, David, once you start working in time travel (and as we established with the time traveling Kamandis sent by Nix, Nix was involved in time travel), pretty much everything becomes a possibility, doesn’t it?
So while I still think it is Mandrakk taking advantage of Darkseid (if not for Darkseid, we’d still have a Mandrakk adventure, it would just be relegated to the land of the Monitors – Darkseid just made it possible for Mandrakk to take his battle to Earth), your take that it is the other way around is certainly a possibility.