User blog comment:Lord of Noobs/Could the Colossal Titan be a Wall Titan?/@comment-5433366-20140906202944/@comment-6516317-20140907033753

I have some weird theory that every single Titan is a Titan shifter.

I mean, the only way to kill a Titan pretty quickly is by cutting the nape of it's neck, and it is shown that a Titan Shifter's humanoid form is in the inside nape of the neck. So, it would make since that that would be the only way to kill it, by directly killing the controller. And that all these Titans are people from "outside" the walls bent on destroying people not like them?

I don't know, I just think about that every time a Corps member kills one by slicing it's neck haha.