Re: Naruto 648
Kushina stated in her history lesson that the Senju and Uzumaki are distantly related (not close blood as KYF is trying to say). That gives Naruto his link to the Younger son and his link to that aspect of this whole conflict between "Senju and uchiha". Going by this, its obvious that not all Uzumaki have Senju lineage. Nagato was mentioned as having it in a throwaway statement to show how he was able to control the Gedo Mazo, while Obito couldn't.