Don't overcomplicate it beyond what it is guys, it's not necessary.
I kept banging on how the visual method to tie up all time lines will have to be complete novum and I'm happy with what they've done - they presented it as "total recall". As "daytime tripping" of the android. We are told repeatedly (by engineers speaking to Maeve) how host memories are different to human's, how human memories are hazy and imperfect, whereas hosts memories are clear as day, precise, difficult to differentiate from "here and now" (Meave slashing throats when recalling old threat etc). Dolores is clearly in the maze - she follows the path of her previous scenarios reliving full drama of the deepest and most traumatic experiences she had as a host. And as we know - suffering is the ultimate cornerstone.
Vonhelmet complains that it's not fully different timelines, just hallucinations or memories - no - the visual tie up method, "the reveal", was presented to the viewer as "perfect memory of the host", but you followed William and Logan in their 30 year old timeline before they met Dolores - you've seen them arriving, changing clothes, going on the train to Sweetwater, their first shag, their first meal, their first kill on so on. Only your point of reference of "when are we" in time when you watch William was provided by Dolores "tripping", that's all. I'm happy with the method and the outcome. It's new and fresh enough and it's clear enough.
Similarly Bernard's "we've had this conversation before" - watch that scene again. This time watch the surroundings - the walls, the shelves, Clem in the background. There are moments in the conversation between Bernard and Ford, when the room changes, furniture disappears, Clem is gone. Either Benny Hill level of continuity errors or again, a hint of different timelines, identical loops, things that happen again and again.
I supported Will = MiB theory from day one, but the closer we get to the end, the more I think of Logan. Not only because of the "I opened one of you once" oneliner, but the more things MiB reveals about himself, the more of a ruthless a-hole picture he paints - the story he tells Teddy about how his wife offed herself with pills because she knew he was an a-hole, how he never felt anything in his entire life until he saw Maeve "ascending" after he killed her daughter. It does sound a lot more like Logan than William. Also, foreshadowing - we are invested in William's story, while Logan is marginal player in the background. We know their story "30 years ago" leads to the "last critical failure and someone dying in the park". Would we care if it was Logan's death or would William's death have bigger impact on us as viewers?