I think Ford is a Host. He was the Master Mold host that Arnold built to help him. Arnold was the creative aspect and Ford was his technical guy. When Arnold decided to make more of Ford by giving his other hosts sentience, Ford had him killed. Directly or indirectly. The "partner that didn't exist" was probably actually Ford because he was built. I don't know if they name swapped or what, but Ford even says that basically no one is left from their early park days except Doloroes, and a roundabout way, Bernard.
It's the modern neo-Frankenstein story. Benevolent creator makes something that in the end turns on him. Seeks to create it's own creations to achieve true 'life'. Kills anyone/everyone who gets in its way.
I like this, except we've seen Ford as a young man, first in Ford's memory of the park before it opened, then in the last episode when Dolores walks right past him. Hosts don't age, so that wouldn't make any sense.
Also, I think at this point it's pretty obvious that William is the MIB. Everything that the MIB has said points to this being the case. I just don't see Logan as a guy who would give a shit about Dolores at all to keep revisiting her in the park. It's makes more sense that William, who's in love with Dolores, would keep visiting her year after year in the park. It also makes more sense because Logan said in episode 2 that he wanted to see who William really was, and it's revealed in episode 8 that the MIB admitted that he had a dark side that he tried to keep hidden for 30 plus years, and that he finally took on that persona in the park a year ago when his wife committed suicide. It also fits in to the MIB saying that he was "born" in the park. At this point, Logan being the MIB would be a cheap misdirection and pretty lame. The MIB goes through a catharsis in the park. That fits more with William than it does with Logan.
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