Board Thread:Theories and Speculation/@comment-30381420-20170117052222/@comment-734582-20170117205251

Phallictus Longiness wrote: So I'm questioning if the Kotoamatsukami has a limit on whoever it effects. As shown in the Gokage summit, it's fairly easy to detect. Especially in a village with Sharingan and Byakugan, it would be really hard to hide such a jutsu in such an influential person.

But Danzo had the well-being of the village in mind. He wanted to become Hokage when the time needed him, but he was also aware that he was able to do far more from the shadows. So it's unlikely he would just Koto his lifelog friend to get what he wants, especially since he can't use the jutsu very often and is better off using it to defend Konoha.