Ahh so, if it is Eren (timeskip) then he actually met his grandfather. Unknowingly, but I don't think its either side, he must've got a clue when they introduced. Btw, I doubt it a little bit because of how the way this Eren Kruger talk. Well, set aside I'm happy I figured out this Eren's identity. I didn't see the timeskip caution afterall.