I think you are right, Madara's plan was to convert Sasuke to the 'Dark' side. But my Q still is why did Madara help Itachi to kill the clan if itachi was ordered by the elders? If Madara loved his clan so much like he claims towards Sasuke, why then did he kill them, and not assist them, or took on as the leader of the clan like he us to be? I mean, his true enemy is the Senju not his own clan????? Also if he hated his own clan from abandoning him and wanted to kill them, he is a couple of centuries to late for that? He would not achieve anything by doing that. Why did he not oppose Itachi when Itachi was orderd to kill his beloved clan? Something doesnt make sense?
Somebody please explain maby why he would have done that. Because I think that would be revealed in chapter 400.
Because I can almost guarantee that Sasuke will ask that q in the next ep