Board Thread:Theories Discussion/@comment-26303991-20150412041202/@comment-6192846-20150412045842

Just to be clear, I'm under the assumption you're theorizing the Demon of Gluttony also had regained its memories due to knowing the term for a "vaccine".

This is a very possible. Banica uses the same point to illustrate the fact it is an anachronistic term for their era and ties it into the demons originally being the god kin.

Unfortunately, it's hard to determine the specifics. The other demons also seem to have their memories about the Master of the Hellish Yard, Sickle, and other figures that they presumably shouldn't know about if they're memory wiped. Yet Banica gets all the memories of the Demon of Gluttony after consuming it which (apparently) include memories prior to the Third Period.

We still aren't given the exact relationship between the Original Sin and the demons so that may help clarify that point.