Naruto only has three truth seekers balls that's evidence that he is not at full strength and also has no intent to kill if he did when Sasuke appeared behind him he could have killed Sasuke or he could have least blocked his Chidori using the black orbs that can take any shape he wants them to he could've made a shield or have them stab Sasuke I think Kishi did this to make this fight more of a struggle for Naruto when ever he has handicaps he likes to show Naruto overcome them but that's just my theory
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