Re: It's official Naruto is Senju
no because getting to the Senju probably took many generations.
Because I believe both the hyuuga and the Uchiha came from the 1st son but 1 took op the chain of hatred and the other didn't. Just like How the Uchiha and the Senju were actually one family I believe that the 2nd son split up too, but 1 became famous and the other wanted to live in peace. Though they might have had connection with the Senju thus gaining the kyuubi holding it out of madara's reach and maybe because their gen was still strong because the last real gen that comes close to RS in the Senju clan was the 1st with his wood.
Cause Kushina's special chakra might mean having the power to control the bijuus or just holding them down.