http://www.onemanga.com/Naruto/462/14/ If u just take it on a surface level then yeah, but he says, Senju and Uchiha, Naruto and Sasuke. And he didnt just say will of fire, he said the "fire of the Senju clan". True it's not confirmed but with Naruto's natural ability to even contain Kyuubi and his natural highest stamina in Konoha, it would be foolish to think that Naruto didnt have strong Senju dna in him. Almost as foolish as it was to believe that Naruto wasnt related to the 4th Hokage before Kishi confirmed it.