Just thinking, slowly. Seems weird that Madara has had multiple chances at getting Naruto/Kyuubi. Wondering if there is something he knows about Naruto, that he is unable to win in a battle against Naruto. He seems hell bent on Saskue fighting him. He has also told Kabuto he can have Saskue after he is done with him. I am pretty sure he needs the Kyuubi to finish his plan. Madara seems to know everyone's powers-how I do not know. So I am guessing he can't take on Naruto for some reason and needs Saskue to do it. Maybe that thread about Naruto's life energy has something to do with it.