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watch between the 3minute and 4 minute mark, and then look at Kagami here in chapter 481 you can see him from various angles through out the flashback.
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Do you think they could be the same person?
I kind of think they could, because we dont know what happened to Kagami, we know Danzo was put in charge of Anbu, giving him an easy in and connection to Dazno and Itachi. And also if Danzo already had his implants of Hirashimas cells, and Shuishis eye, he could have controlled him like I think he controlls the other elders in the village, sans the 3rd hokage.
Anyhow, all ideas votes, are valid.