Can be PLEASE ****ing stop with Danzo KA one-shotting? Do you people even read the bloody manga? Mifune snapped out of its hold because of a simple interruption. Even 'normal' genjutsu isn't broken that way. Even that requires introduction of chakra into the head through another person or if the person disturbs his own chakra inside his bloody head. Mifune did none of that and was snapped out regardless. In fact, KA works regardless of the affected individual's knowledge of the Jutsu or not, just like Kakashi knew he was inside Tsukuyomi but couldn't do jack.
Don't compare his usage to Itachi's, whose use of KA managed to break him out of Kabuto's Edo-Tensai's hold. Even the thought is laughable. As for Danzo, then he died a fitting dog's death 11 times.
