User blog comment:Corny4life/the cage./@comment-1975828-20160126171341

I do believe Rowena lied, just to impress Lucifer, not knowing he was going to kill her if she were the only one who could open the Cage.

It only takes a witch powerful enough to read the Book of the Damned for someone to be able to cast the Cage-related spells, I think. Rowena knew how to read the Book safely so...if there is someone else, who can do as Rowena can, then at least Michael and Adam have a chance of getting out.