User blog comment:Inept Wiki User/Speculation: The other Celestial Spirits/@comment-4829046-20130612024404/@comment-7418318-20130612143604

There is also Angel. While she lost her Zodiacs, she still might be in possesion of her silver keys (the way she talked, it sounded like she took many keys from other celestial mages she defeated, even though we only see her use Zodiacs and Caelum).

And then there would also be Duke Everloo. While he might be imprisoned and key-less, he's still a celestial spirit mage.