Your personal Tumblr library awaits
Keith Shadis asking little eren about Carla and Grisha:
he’s already great because he was born into this world.
What do you think of Eren killing his Mother? I think that's the only major part of the chapter you haven't talked about.
At first I thought it was just thrown in for the sake of shock value, but looking back at Chapter 96, it was indeed foreshadowed.
It works so far as the revelation about the Reiss massacre works, in showing that Eren is free beyond even cause-and-effect - that he in himself is the Prime Mover, in Aristotle's terms, and in that regard godlike.
Buuut this ending seems to suggest that wasn't the kind of freedom Eren was angling for in the first place. Even if it were, an argument could be made that the Reiss massacre revelation was enough to prove that.
Regardless of this twist's inherent worth, its execution was bad. It felt very crammed in amongst all the other revelations the final chapter gives us; and what's more, you could cut it out of the final chapter and change nothing fundamental about the story. It doesn't even have much of an effect on the course of Eren and Armin's conversation.
But it does provide a conclusion to this piece of foreshadowing, at least.