Since he only has a half of Kyuubi chakra in him?
We saw how he was injured and exhausted due to the 4 tails Kyuubi .... so , If he went or will go for more the pressure on his body will be more massive and cause him fatal injuries and if he went for 9 tails there will be no more Naruto ....
We saw how he was injured and exhausted due to the 4 tails Kyuubi .... so , If he went or will go for more the pressure on his body will be more massive and cause him fatal injuries and if he went for 9 tails there will be no more Naruto ....
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