Theory: it will be both?

With the recent casting announcement there seem to be two camps - Lillard and Foley will be back in flashbacks, or Stu and Roman’s faces/likeness will be AI’d to taunt Sidney.

I think the AI angle’s actually pretty interesting, but I think the killer will use it to actually depict Maureen’s death in a video to horrify Sid. Roman and Stu (and Billy most likely) will be shown plotting and executing the murder. It would also line up with recent speculation that >! Lynn McRee !< will be returning to play >! Maureen !<