why would you say minato is a jinchuuriki?
Well, he sealed the Kyuubi Chakra inside himself before he was taken by the reaper. So technically, he is a jinchuuriki? Maybe the fact that Naruto tamed Kurama could possibly make the other half of him tame too. Although, technically, Kurama is just a segment of the Juubi's chakra, if you split that again, into two parts, who knows if the personality is constant.
We dont know if minato will come back. It's unlikely but I am still hopeful! It would be an awesome twist!