It's funny because my gf and I watch this one together and Bernard being a host is one of the earliest "what if!" thoughts we had. Like, episode 3 I think. Lots of other ideas we have on it, that I've confirmed by reading reddit/gaf OT. Definitely immediately thought Theresa was being made, yes. The three different timeframes add for an interesting dimension when trying to figure Arnold and MiB out. Everyone seems to think Bernard is Arnold in host form, and that does go well with Theresa being replaced... Ford just replaces people who die (accidentally or intentionally) with hosts. Also that William is the MiB with the 30 year gap in story. But there are convincing arguments to the opposite too, so I'm just really unsure now. Also really not sure what to think about Elsie. Who took her, and what happens to her... comes back as a host? Just so many possibilities.
Lots of cool theories out there. Dolores is Arnold (Dolores Arnold, surname) and one that we're seeing shit in reverse. Don't love those, but they're fun to read. The thing that got me was when Theresa is looking at the design plans before she's killed, it's Dolores and Bernard. So IF those are real people Ford is replacing, who was Dolores? If not, they're hosts Ford creates for his own grand design. What's Dolores' mission/job? I do think William is MiB but it seems so obvious. Then again so did Bernard being a host. Maybe Arnold is alive. That's part of why this show is so magic to me, I think things, read things other people believe, and then have no idea anymore. Probably best if I watch the last three episodes without consulting any discussions on the matter!