Well, we know Delores is the oldest host and Teddy is nowhere to be found in the William timeline. On other message boards, someone also pointed out that the company logos when William first arrived at WW in episode 2 match the ones on the lab coats during the CGI Anthony Hopkins scenes, but not the ones shown in "present" day. Seeing Lawrence get his throat cut by MiB and then having him be a completely different character when they switch back to William completely proves this too.
I'd have to go back to confirm, but I think there are two problems with this multiple timeline idea:
1. Ford mentioned that the hosts have had their roles changed as they switched between narratives. For example, the host that played Delores's father was once part of the cannibal group. (I'll just refer to him as "the cannibal".) If that's the case, would Delores being the farmer's daughter mean that they're at the same point in time as the Man in Black since Delores is the farmer's daughter at that point too?
The only defense that can be mounted against that is that the cannibal could've been a replacement for the host that previously played Delores's father. Of course, we have no idea if there ever was a previous host in that role, but we do know that they can replace them as they did when they decommissioned the cannibal.
2. If I remember correctly, William's (future?) brother-in-law mentions that their company is looking to buy the park, and I'm pretty sure he mentioned one of the opening partners (Arnold) that died. He seemed to be referring to the same time having passed (30 years) since then leading to me believing that it's the same time period.
Now, if there isn't a time disparity, the brother-in-law's company could be the one that's referenced a lot by the park operators.