ok, i've read a couple of theories about the geu but i already made a theory about him so here's my other one. the geu might be ansem or ansem's shell because ansem lost his heart- maybe the sitting un known is riku or some other part of him. remember inreverse/rebirth when zexion said that riku had a scent like the superior. maybe the the superior is...i don't know riku's shell. that would explain why the geu says, "he looks just like you." i truly am sorry if this has been posted and don't flame me too bad.