I'm not sure I entirely support the Man In Black = Arnold theory at this moment, unless... and this is a massive reach right now, Arnold uploaded his consciousness into a host and is acting like a guest in order to unlock the final "stage" of the pyramid. I forgot what the different stages of the pyramid were as explained by Ford but the final stage might be something resembling "the will to live". Both Delores and Mave had flashbacks of what the Man In Black did to them, in Delores' case even overriding her programming preventing her from using a gun. This kinda goes back to my "fly" theory from the first ep, the step to consciousness is for the hosts to be able to overstep their programming. The most instinctive way to do that is make them self aware of their existence and then force them to fight for the continuation of that existence.
Side-note since nobody mentioned it but the stray very deliberately destroyed his own head to prevent the programmers from analyzing him. Which may be code written by Arnold, the voice of "God".
I definitely believe one of the main characters in the facility is indeed a host, and Bernard is the only character so far that's been given enough material to fit the mold. I don't think it's a coincidence that this episode features a very obvious juxtaposition with both Bernard and Teddy being given back stories (including their very own set of flashbacks). In Teddy's case of course we literally see him being given his back story, and for all we know Bernard's dead son is actually implanted to motivate his behaviorisms. Because despite the things Ford said this episode, I still believe he is pushing for the hosts to achieve consciousness as well.
.... I'm bugging brehs...
regarding Delores adapting. Or maybe i'm thinking something else. 
