May I introduce, Amelie White.
Her first and only named appearence was in The Consequence. When having a close look in the police department, you can find some missing and wanted posters. One of them shows a wanted woman called Amelie White.
Knowing her face, you may recognize a painting in many places throughout the main game and the DLCs that shows a woman who looks very similar to her.
So assuming the woman at the painting is Amelie and her portrayal is in almost every house in Krimson, Elk River and Cedar Hill, she gotta be a famous person. Now what if I tell you that Amelie looks pretty similar to Emily Lewis from The Evil Within 2?
So let's say the former and wanted Amelie White disappeared one day and came back with the new identity of Emily Lewis to escape the police and who became the famous model that everyone got a painting of her.
Making the theory more clear, let's remember the basement in chapter four of The Evil Within. There was a photography studio and the photographs there reminds extremely at Stefano Valentini. It shows pictures of screaming people or close ups of their mouths. So he may lived in Elk River once. A newspaper at the beginning of The Evil Within wrote something about mutilated bodies found in Elk River. Who said it can't be Stefano's failed sculptures instead of Mobius' or Ruben's work?
We could assume that the criminal minds of Stefano and Amelie came together someday, being a villain duo. He could have helped her changing the identity from Amelie to Emily. As Lewis, she became populare and went together with Stefano to Krimson City where he could act out his lust for art. Maybe it was Amelie who even showed Stefano what he could become in the first place.
In fact we know almost nothing about Stefano's early life so it's at least a possibility.
Theory Enhancement 1:
Before going into the basement, you can see an image that shows a girl who looks very similar to Lily Castellanos. Maybe Stefano and Emily tried to get a baby but they couldn't for some reason. So they searched for someone to adopt and finally they found her. The pictures in the photography studio shows probably Sebastian, so he could have watched the Castellanos family for some time to get close to her. Maybe Stefano entered Union just because of Lily. To get her and take her out of STEM, becoming a family.
Theory Enhancement 2:
Leslie fled right into Stefano's house and not into the hospice as Jimenez assumed. It's almost a crazy idea but Leslie might have sensed Stefano's for STEM correspondent mind and felt like pulled to him somehow.
So you could say these are some basic ideas from The Evil Within, enlarged and filled into The Evil Within 2.
I hope you guys like my thoughts. Tell me what you think.