Wow, the Amiguchi story (possible 100% Amiguchi spoilers) really drops a lot of the big overall world/story reveals. Also it wrapped up really fast, I think I went from 35% to 100 in one story thread? I think what I've seen here solidifies my theory that there is no time travel going. When they talk about Sectors, they literally mean different sections of a whole location. Whether this is an AI world or a huge spaceship still remains to be seen, I'd lean spaceship at this point.