you gotta have good pictures so every1 can see the resemblances more clearly to support your theory.
Spoiler!


As for my opinion, no, Gedou Mazou is not the actual jyubi's body. However we do know it plays a role into the rebirth of the jyubi as it's collecting and containing the chakra. I think Rikudou created Gedou Mazou prolly in the image of the jyubi.