Originally Posted by FTW!!!
Why does Minato say that it is conceptually impossible to seal the Kyuubi completely inside one body (Naruto's in this case)? I think Kushina and the previous Jinchuuriki had the complete Kyuubi chakra sealed within them. After all that huge demon fox did come out from Kushina who is one Jinchuuriki, so why can't it be sealed completely in another one?
If Naruto had the complete Kyuubi chakra, it would have been awesome and he would have had so much more power!
He said it was impossible for him to seal the kyuubi entirely using the death god jutsu. Meaning he couldn't permanently seal it away with his own soul in the death god's stomach. Knowing this, and that Madara was after the bijuu, Minato opted to weaken the kyuubi by taking what he could with him.