When Naruto arrived, he and the toads fought Pain. The only other people of the Hidden Leaf, in my opinion, who were powerful enough to help would be:
- Kakashi and other dead people
- Guy—not in the village
- Tsunade—in a comma
- The Uchihas—seemingly defected from the Leaf
Where was Danzo? He would not have wanted the Leaf to be destroyed, so I would imagine he would help here and also when Orochimaru attacked the Leaf in part 1.
Is there any hard evidence to support why Danzo didn't help in either attack?