Yes, intuitively unleavened made more sense to me. In perhaps a more simplistic sense, that leaven represents sin, and the bread becomes His body.
It's been a while since I read the Orthodox reply. I remember that I was satisfied with it, but now I can't bring too mind what the reason was (sometimes I read more than I can remember apparently, lol).
I am always interested in the answers I hear about Eastern Rite Catholics. Maybe that answers something I think I decided not to post in one of these unity threads - I think EO and CC.
The problem would seem to be that neither is likely to compromise, and the Catholic dogmas, if retained, would excommunicate most EO. I'm not sure just what the Eastern Rite Catholic looks like or believes, but it makes me wonder. Do they depart from any of the dogmas of the Catholic Church? Or is it more a matter of practices only?