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I think that's the other half of the kyuubi, i think in like 3-4 chapters minato will give the other half of the kyuubi to naruto and maybe we're going to get another bijuu mode
Minato feels useless now with one arm so he will definitely probably go away now.. into Naruto..
that is the other YIN KURAMA >_> this chakra is UNTAMED though.. <_<
I also want to point out Minato doesn't have Sagemode.. <_< we know... >_>
I think that's the half that minato stole from the kyuubi and somehow they were able to communicate with each other.Even the other haft of Kurama approves of Naruto, the next few chapter will be exciting.