Read some thing speculating that Ford will probably create a host version of Theresa to hide the fact that he had her murdered
Which also "begs the question" of how many other employees met a similar fate for trying to meddle with Ford's plans,,,
Also a theory about Bernard actually being a host version of Arnold, who was murdered by Ford? Idk if that makes sense though, for a robot to have a different name and personality but look exactly like Arnold? Has no one else ever seen the real Arnold?
I think that theory is based mostly on when Ford showed Bernard this photo and said that it was a photo of Arnold, but the 2 people in the photo are Ford and his father. Looks like there is a space for a 3rd person that Bernard can't "see" which is y people think that Bernard couldn't see "himself" / Arnold.