Why Oro and Kabuto didn't sommon the 4 hokage before?
The mask and scroll aren't enough. You need to be in Konoha in the Ushiha basement too. They didn't succeed in getting there.

Quote Originally Posted by Temperjoke View Post
Originally Posted by Temperjoke : "an Oro-redemption would come out of the blue. Nothing happened that would make him reconsider his position. He may be a key-character, but redemption... Although, with Kishi, you never know"

O.o I didn't say that
You're right. Sorry about that. It was in an answer from Lakritze to your post. I wonder how this went wrong.