This is why I think Lucifer is ultimately behind the Black Council, with a Denarian who is not Nick, on it. Nick was being used to recruit the Archive, not for the Denarians but for the Black Council.
Lucifer using his power like this has terrific consequences, the reward must be equal to the risk. The Archive is currently aligned with the White God through the Accorded Nations, the Denarians too were part of the Accords at that point, but subsequently left. Lucifers ultimate aim is to replace WG running creation and wants the archive to survive as a bailiwick against the Outsiders, under his wing fighting the oblivion war. The Outsiders want the archive destroyed. Given who the Black Council have targeted I think they want the White Court, White Council and Archive in their camp, the most human of the Accorded Powers