Board Thread:Manga/@comment-27441457-20171108210024/@comment-1327106-20171109181409

The reason I'm inclined to believe it's Jean rather than Armin is because Pieck says he's familiar. Armin was crispy and in all likelihood unrecognizable when Pieck saw him (since he just had his full body cooked by Bertolt).

With our mystery soldier, Pieck focuses on the facial hair, implying that if not for that, she probably would recognize him. If it was Armin, just having skin would be enough to make him look different to her. A beard would not be required.

Though Connie is also possible if we assume the soldier is from the 104th, he was off to the side and she might not have looked at him.

But Jean was directly in Pieck's way when he rescued Hange, and he was facing towards her when he did it. She definitely would have seen his face.