User blog comment:256k/(SPOILERS) The 4º Wall / The other city theory/@comment-5995523-20131018161816

1. That's what I want to know about the towns outside the walls where Reiner and Co are from.

2. I doubt Grisha is dead. We're probably going to see him real soon and learn the connection between him and Ape Titan.

3. Ymir and Historia are both important characters. Historia serves as a focal character because of her family's secret about the wall titans and was suicidal when she overheard a few Wall Cult members mentioning that she was an illiegitimate heir to the Reiss household because of her mother being a lower class. I know why Ymir wanted to take her outside the walls, she wanted Historia to stop being suicidal and have a 2nd chance at life.

4. In their attempt to infiltrate the Human walls, Reiner and Berthold didn't realize the mass murders they committed until later on. Mikasa wanted to kill both of them, but her anger was stalled by Berthold's emotional confession. It's revealed that he and Reiner regretted the mass murders for a long time after befriending the others that made them question their hatred for humanity.

5. Eren is important because he has an unstable ability that makes them want to kidnap him, maybe kill him when they find out about the contents of the basement in Wall Maria's Shiganshina district. The only person who can pose a big threat to their plans is Mikasa because she will go all out to keep her adoptive brother safe.