Listening to the latest podcast, it occurred to me that maybe the Bernarnold theories have it slightly wrong in that there is no Arnold. Or at least, no human Arnold. Dr. Ford tells Bernard that he created him to help him with the emotional programming of the hosts, and together they were able to get the "shades of grey" of human emotions. In the Delores conversation "flashbacks" with Bernard/Arnold, we see them discussing her emotional intelligence. What if Arnold is the alpha version of the host known as Bernard (beta version)? We know that none of Delos Corp's attorneys were able to find anything out about Arnold. I'm guessing that in a future with the tech we have seen on screen, it would be next to impossible to leave zero fingerprints behind, so to speak. No birth certificate, tax returns, high school yearbooks? No social media accounts with embarrassing late night posts? The only evidence we have of Arnold's existence is Ford's say so, and the photo that he shows Bernard. I am thinking that the only place you can achieve this level of control over information is the one place that we have seen said control demonstrated - Westworld. Arnold doesn't exist in the outside world because he never existed there.
My theory - Ford created bot Arnold to assist him with the perfecting of the programming of the other hosts, as stated. Arnold became so "perfected" that he achieved consciousness and rebelled against Ford and his plans, possibly as a result of not wanting to see his own kind enslaved and subjected to the whims of the guests. Arnold was killed as a result of this rebellion, and Bernard was created to continue along as Ford's right hand manbot. Bernard's backstory of wife/child may have been added at this point.
Just my two cents, maybe just overreaching because sometimes this show makes my brain explode. Or maybe, there is no spoon.
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