Naruto has his sage modefrom training and got upgraded by sage + 9tails beast the esence of juubi can explain his rikoudou mode how did sasuke get the juubi eye from SO6P he didnt eat the fruit like kaguya even SO6P dont have that eye +he is not a jichuriki he doesnt have any relation with 10...
how did sasuke get the juubi eye from SO6P he didnt eat the fruit like kaguya even SO6P dont have that eye +he is not a jichuriki he doesnt have any relation with 10 tails or his chakra