Tobi met up with Danzo some time in the past for unknown reason.
Tobi stated that Danzo's sharingan and Hashi DNA probably meant he wanted to control the Nine-tails.
Tobi knew when and where Kushina was going to give birth.
I think Danzo was his informant, and given his somewhat shady actions I could be right.
Therefore I think Danzo was (at least a little bit) responsible for the attack on Konoha.
Tobi stated that Danzo's sharingan and Hashi DNA probably meant he wanted to control the Nine-tails.
Tobi knew when and where Kushina was going to give birth.
I think Danzo was his informant, and given his somewhat shady actions I could be right.
Therefore I think Danzo was (at least a little bit) responsible for the attack on Konoha.