Oh. He didn't personally have anything to do with the fight, but I'm talking about the flashbacks. You only get part of the story about the Uchiha massacre at this point.

If Danzo hadn't tried to stop Shisui from stopping the Uchiha coup then Itachi wouldn't have had to massacre the clan.

Then Sasuke wouldn't have been an Avenger and then he wouldn't be going to Orochimaru for power.