Upon further thought- namely, the different logos- I'm trying hard to decipher how it could still be two storylines. And it's a simple one- what if Delores has done this before?
What if she deviated from her path before? What if she tried to chase down the maze before- which is how the man in black (now William) found out about it in the first place? What if that deviation is what sparked the "critical failure" they had 30 years ago?
Another thing to look out for- Delores had some flashbacks of a terrible event that happened at a church sometime in her past (who knows how far in her past). That same church steeple is the same church steeple that we see totally buried in the sand regarding Ford's new storyline we saw in episode 3 (where he "tamed" the snake"). We also saw that ford will demolish and change anything on a whim- like the hotel/restaurant he is at currently stating "I'm not nostalgic". So now we know universal owns Westworld, and not Disney. Plus construction seems to move much faster.
Last nugget/takeaway- the man in black is very devil like. The hosts are currently in a loop of ignorance, much like Adam and Eve. They didn't know evil existed, much as the hosts don't. The devil "set them free" by giving them the knowledge of evil and all the perils that came with that- death, consequence, etc. It sounds like the man in black wants the same thing- to "free" them. He, in fact, says they aren't responsible for any of their decisions and he wants to change that. Much like the devil, MIB wants to be God and thinks he knows better by giving the hosts, much like Adam and Eve, sentience/knowledge/understanding.