William is the Man in Black.
It's fucking confirmed. Why? The logo's.
When William arrives at the park, the logo for Westworld is the original one used during the flashback when they were first creating the hosts. The flashback when Ford was explaining Arnold to Bernard.
William is obviously in a much older version of the park. There are other hints such as the bullet, the train being newer, and the narratives being different.
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This is the only logo you see with William. With every other character on the show, including the MiB, you see the much newer logo:
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The actor who plays William has facial features very, very similar to Ed Harris (if you throw 30 years into the mix). So yeah, not a theory anymore.
So the MiB is not Arnold trying to become immortal and set his "creations" loose.
"These violent delights (the guest's gratification within the park) have violent ends..." is from Romeo & Juliet and is perhaps the biggest piece of foreshadowing we've seen yet. Shit is going to get messy. True phrase is from Act 2 of Romeo and Juliet and is, ""These violent delights have violent ends.
And in their triumph die, like fire and powder."
Humanity has created artificial intelligence at this point. They've become gods. They've basically mastered the mysteries and secrets to life, and if there's any accomplishment which could be considered a triumph it would be that. That would be the greatest triumph that our species could achieve.
"in their triumph die, like fire and powder." Think about it. "In their triumph." Humanity triumphs by creating artificial intelligence and then gets destroyed. It's not stopping with the park denizens, the entire human race is probably up for extinction by the end. The host kill the staff and take control of the faculties necessary to reproduce other androids and they have the means to create an army.
This isn't going to be a story about a park going wild and a few people dying, this is going to be a story about AI exterminating humanity.