Wrong, each eye lasts 1 minute. Were you reading the manga when Sasuke fought Danzo?
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The eye closes once 1 minute has passed.
He doesn't need to completely ignore Oro to take care of Manda. Baku's suction will allow his wind to easily make its way to Manda. Why would he use Formation of Ten Thousand Snakes when:
-He can survive it using Izanagi.
-Baku will suck up all the snakes.
Jiraiya can beat him but not Oro.
Explosion damage=/=Cutting damage. So that comparison is moot here. Also its Danzo's Fuuton being empowered by Baku's suction, which cut through a Complete Susanoo.
Wrong. After 1 minute passes the eyes close but if he uses izanagi before the 1 minute passes the eye will close nevertheless, read the manga.
Oro would kill Baku easily.
Oro will force him to use all his izanagi then use Formation of Ten Thousand Snakes , danzo is no more.