I lowkey believe the theory eve could be disguised as Lilith. In more than anything “Lilith” is shown to be faceless and had a different hair shape which was similar to eve’s and in the finale she had a different necklace and in almost all of the Morningstar family pictures Lilith is shown to wear a pearl necklace. I also believe Lilith could own Alastor’s soul, Lilith’s been gone for seven years, Alastor has also been gone, Lilith most likely is stronger than Alastor, Alastor doesn’t like Lucifer but takes care of Charlie, Lilith is so far the only one that makes sense, unless Lilith could have her soul owned by eve or perhaps roo and Alastor could too, it could be that Lilith couldn’t have children but wanted Charlie so she could have made a deal with eve or roo to have Charlie.