Dragon Sage Mode is enough for Kabuto to take on Danzo, and that needs no prep time..why would I ever suggest Kabuto needs Edo Tensei to deal with the likes of Danzo? Oro doesn't need it either and Bee can beat him also.
First of all Oonoki can fly, which already puts Danzo at a disadvantage and his Rock Golem can pretty much take on most of Danzo's Fuuton attacks, Baku is taken care of by Onoki's Jinton. Onoki simply needs to keep on killing Danzo with his Rock Golem along with his
Rock techniques and then Danzo is finished.
Muu can also fly, just like Onoki, and he can turn invisible so Danzo won't be able to see or sense him. Muu could even take Danzo out at the beginning of the fight once he becomes invisible as Danzo needs to make some handseals before he can activate Izanagi and Jinton moves too fast for him to be able to complete the hand signs, but that's unlikely as Danzo usually starts the fight out by activating Izanagi.
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