I just read few things about what happens in chapter 51 and i thought it would be great to share them with you guys. But, please be aware that this post contains spoilers. Well first Hanji discovers, or hypothesizes better, that all titans were once humans. Erwin looks like Mike and ...... Eren, Mikasa, Sasha, Connie and Jean, who is not dead, are the new members of the Levi Corps. I think that this chapter is really nice judging from what i learned. Write your thoughts and have fun answering.