Board Thread:Questions and Answers/@comment-29752445-20170416212138

So I was wondering, we all know reiner and berthold entered the walls in search for the coordinate power, trying to steal it, but when did they figure out it was Eren?

during reiner breadown, revealing Eren their true identity, he told Eren that if he comes with them, the walls will be saved, as if he knows Eren is their target.

but how? how did they know Eren has the coordinate? he could have just been a shape shifter, they didn't know frieda was eaten by grisha, so they had no idea of knowing 2 shifters merged to 1

some things in the manga just don't make sense. 