I'm glad to see interest in Susan's case again. I know this is totally lame of me, but I got really sick not too long after my last plan to see what I could find for her (along with Stephen Pease who was found deceased a day or two later, and Bryce Laspisa but I think his school-mates would be on break right now). It's been so long I didn't realistically expect to find anything, but I hoped to. Finally feeling better and I hope I can do it soon, but it's been harder to find travel companions since it's so cold and icy and the holidays are here.
Along the lines of what Salem said I think it's more like "anyone's a potential POI" but there's not an actual POI at this point.
I strongly feel it's unlikely there's some random stranger. I think there would be more uproar in the community by now, or at least I hope so. Whenever I ask about it to LE or MSM I get "we're still investigating," but I never get the impression (IMO only) that there's some danger to the community other than your average every day danger.
I'm still very sad that Susan has missed so, so much... something in me hopes she can come home and make up for missed time even though I know how incredibly unlikely it is.
(((hugs))) to Susan and loved ones, especially her grandbaby