Where is this information from the Delos site?
Dolores being the killer of Arnold would seem to be the key incident from 30 years ago that changed the park so dramatically. I was struck by the multiple timeline shown in that vignette as dolores-showing no blood from the stab wound-- finds her way back to the town in the cowboy outfit, reverts to the blue dress off and on and reverts again to the cowboy outfit when she leaves-- are we meant to see this as a sequence apart from the stabbing timeline?
I am just not convinced that William is doomed to become MIB! Logan struck me as a more likely candidate but I will patiently wait for more concrete evidence from next 2 shows...
your point about these conversations being from an earlier time are interesting-- at first I thought there were 2 basic timelines; now I feel like there is a nexus of timelines all connecting with Dolores which connect to all of the hosts and characters.