There have been a lot of discussion concerning this matter, whether he is a pseudo Jinchuriki(only possess Kyubi's chakra), or a Jinchuriki(with Kyubi inside him). After thinking about it, i came to the conclusion that he is infact a Jinchuriki(he does possess a half Kyubi in him). I'll explain:
Remember that
And when you look at the above panel, it seems that the remaining Kyubi isn't even half as huge as his former self, so it's safe to assume that Minato infact sealed more than half of Kyubi within himself(which would mean that the yin chakra is actually not only darker but also greater than the yang part)
As a comparison lets take Kyubi when
This is how he looks
Like you can see, we don't observe a decrease in size at all, only a more squeletic form and it's safe to assume that the FRS he received served to weaken him to this state
This shows that if Minato only took Kyubi's chakra like some people think, Kyubi shouldn't have decrease in size at all. It leads then us to the conclusion that Minato does possess Kyubi inside(the yin and dark part of it). So Minato is a Jinchuriki
Now i'd also like to explain the reason why Minato has KCM. People think it's plot. Well, it's far from being the case. Remember what Sarutobi said
"The soul sealed together will battle for all eternity"
So the fact that Minato sealed the yin chakra of Kyubi along with him means that they were fighting for all eternity inside the God of Death's belly. The fact that Minato has KCM simply means that Minato won the battle against Kyubi
It would also explain why Kyubi was shocked and surprised after Minato turning into that mode
So like you can see it is not a plot hole. Maybe Kishi will further explain later at some point
Remember that
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inside himself, Kyubi's size reduced greatly
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And when you look at the above panel, it seems that the remaining Kyubi isn't even half as huge as his former self, so it's safe to assume that Minato infact sealed more than half of Kyubi within himself(which would mean that the yin chakra is actually not only darker but also greater than the yang part)
As a comparison lets take Kyubi when
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This is how he looks
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Like you can see, we don't observe a decrease in size at all, only a more squeletic form and it's safe to assume that the FRS he received served to weaken him to this state
This shows that if Minato only took Kyubi's chakra like some people think, Kyubi shouldn't have decrease in size at all. It leads then us to the conclusion that Minato does possess Kyubi inside(the yin and dark part of it). So Minato is a Jinchuriki
Now i'd also like to explain the reason why Minato has KCM. People think it's plot. Well, it's far from being the case. Remember what Sarutobi said
You must be registered for see images
"The soul sealed together will battle for all eternity"
So the fact that Minato sealed the yin chakra of Kyubi along with him means that they were fighting for all eternity inside the God of Death's belly. The fact that Minato has KCM simply means that Minato won the battle against Kyubi
It would also explain why Kyubi was shocked and surprised after Minato turning into that mode
So like you can see it is not a plot hole. Maybe Kishi will further explain later at some point
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