Quote Originally Posted by Erin1491 View Post
Second. How is Otis able to be an endless on both solution nine and living memory. He volunteered to be experimented on and became one of the early versions of an endless correct? Which is why he inhabits an older model body. He sacrifices himself in the battle for solution nine. The queen implies that's the end of the road for him. Yet we still meet his memories at yesterland in living memory. How is this possible?
Otis offered himself up to be experimented on, not specifically to become an Endless but just general soul stuff. From these experiments both his robot self, with his actual soul, and his Endless, which are merely his extracted memories made form, were born. His robot self is also not considered an Endless, because it still contains his actual soul.
Sphene saying it was the end of the road for him was about the true Otis. The Endless Otis would still go on, but would not gain true Otis's memories from after the experiments.

As for the first question, I have no clue and am very curious too.