Board Thread:Naruto Discussions/@comment-26773508-20150905054531/@comment-23887466-20150905101934

Even though it was a dangerous gamble, what Minato wanted happened. Also Minato didn't know that Kushina would be saved by resealing Kurama into her, years later Kurama would reveal this fact.

You see, the whole point of sealing Kurama into Naruto, was so that their Chakra will be mixed by time, since as we know to use Kurama's Chakra Mode, you need to sync your Chakra with Kurama, and the seal that Minato used is what allowed such a thing to happen, and thanks to the same seal Minato was able to use the same mode.

In my opinion, this is not bad writing, rather it just show how Minato was amazing.

Edit: also remember that Kushina wasn't ok with Naruto being a Jinchuriki. Only Minato did.