Board Thread:Theories and Speculation/@comment-34277398-20180124015008/@comment-734582-20180124064017

Minato seemed unaware of Yin Kurama until in the war.

But think about it for a moment: Edo Tensei seals a soul in a body. But Orochimaru only prepared 4 sacrifices. Since Kurama was sealed together with Minato, he was put in the same Edo Tensei. Kurama thus isn't quite sealed in Minato. Rather, they're both sealed in the same body.

Secondly, Yin Kurama seemed aware of Naruto and his exploits, so it seems to me that Minato was simply allowed by Yin Kurama to use his power.