Muu should win mid difficulty. Izanagi respawn strikes can
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. With no way of perceiving Muu, Danzo's left vulnerable to getting his head cut off repeatedly for ten minutes straight, or if we give him the weighted boulder jutsu he can one shot Danzo by immobilizing him, and then wait until Danzo's izanagi runs out (Danzo won't respawn since he doesn't actually take damage from the jutsu, and he can't suicide or undo izanagi due to being immobilized.) Baku is the only tricky factor in this fight, but Muu could potentially anchor himself to the ground with the heavyweight technique and then fire a Jinton to kill Baku.