As many people have theorised, Kaguya is currently divided into three parts :-
1) Kaguya's Will :-
2) Kaguya's Spirit :-
3) Kaguya's Corpse :-
Reviving Kaguya :-
So, what do you think ?
1) Kaguya's Will :-
This is pretty obvious considering that it was revealed this chapter. Kaguya's will is Black Zetsu.
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2) Kaguya's Spirit :-
As many people have theorised Kaguya's spirit is the Reaper Death Seal Spirit sealed in the Uchiha Stone Tablet.
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3) Kaguya's Corpse :-
Personally, I think that Black Zetsu was created from the Gedo Mazou by Madara. Thus, let's assume that the Gedo Mazou is the corpse of Kaguya.
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Reviving Kaguya :-
1) The three pieces to reviving Kaguya are Black Zetsu, Gedo Mazou and the Reaper Death Spirit.
2) Prediction Time : Black Zetsu extracts the Gedo Mazou from Madara and then somehow releases the seal on the Uchiha Stone Tablet to release the Reaper Death Seal. I think he will be helped by Orochimaru in this.
3) Then, Black Zetsu and the Reaper Death Seal enter the Gedo Mazou. The Gedo Mazou gets revitalised and transforms into the revived Kaguya.
2) Prediction Time : Black Zetsu extracts the Gedo Mazou from Madara and then somehow releases the seal on the Uchiha Stone Tablet to release the Reaper Death Seal. I think he will be helped by Orochimaru in this.
3) Then, Black Zetsu and the Reaper Death Seal enter the Gedo Mazou. The Gedo Mazou gets revitalised and transforms into the revived Kaguya.
So, what do you think ?