Madara did say to Sasuke that the Senjus have held on to the leadership role for the village ever since the truce between the Senju and Uchiha clans was initiated. I believe almost every die hard Naruto fan should be well aware of the fact that the late 4th Hokage is indeed Naruto's Father. Based on what Madara has stated Naruto is in fact of Senju descent. Just check out the links, if you still disagree.
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Madara may not know that Naruto is the son of the 4th Hokage but because of the Senju and Uchiha's deeply rooted bond of everlasting rivalry, he can see the Senju's will within Naruto just as easily as he can see the Uchiha's will within Sasuke. As Naruto has pointed out, he and Sasuke are top class Ninjas now. They are both representatives of the strongest clans that the ninja world has ever seen. But which clan is the strongest? Madara did not die at the Valley of the End, so the question has yet to be answered. The final confrontation between the Senju and the Uchiha, Naruto and Sasuke will finally give an answer. It's their destiny.
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