Did you guys hear about the fan theory about the Man in Black? There's a theory going on that the events we see in the park are two distinct timelines;

1. Dolores, William etc, 30 years before the present.
2. The Man in Black, Teddy, Maeve, etc timeline, in the present.

The theory goes that William is the man who turns into Man in Black, and this theory seems to hold a lot of ground. We know Man in Black is one of the oldest customers and been coming into the park for 30+ years and we know Dolores is in fact the first host in the park. Also, if we think of events being in the same timeline, it felt a little odd to begin with that Dolores was in love with Teddy and all of a sudden now she's in love with William.

This will make things very interesting!