Board Thread:Theories and Speculation/@comment-1783334-20150507053750/@comment-25227224-20150507062922

Again; It's a stretch. But the attitude and information that the hooded character has is antiquated compared to what occurred. His opinion of the battle between Sasuke and Itachi. His opinion on the Uchiha. But what destroys my statement is that Danzo wasn't fond of the Uchiha.

Also, Izuna & Shisui are dead. Shisui wouldn't be able to use the ocular abilities of the mangekyou. Because Itachi had one, and the other was taken by Danzo. My theory is just as much as a stretch as yours. Kagami is pretty unlikely. But I'm not dismissive. It's also a weird one because : it'd have to be a member close to the Akatsuki.

White Zetsu may have possibly survived when he was attacked by Sasuke. Shisui would have no goal in killing Sasuke. That's if we're accepting the non-canon appearances.