trust it if danzo could have gotten rid of the third he would have done it.Kotoamatsukami can be broken if the one who got hit with it realizes that he might have been as ;long as there is knowledge of the jutsu in mifune broke out because of ao telling him of what it does and knowing his judgement might have been impaired. third and ennma would have knowledge of this jutsu (shisui was famous) ennma would have snapped him out of it.