Board Thread:Naruto Discussions/@comment-3965545-20150831022047/@comment-734582-20150831102047

QuakingStar wrote: that Kurama was split for some reason and put the Yin half into Menma and the Yang half back into Kushina. I've been wondering lately about Minato's little trick with Kurama and Naruto. he seemed awfully sure of what he was doing. Also, he could somehow already summon a baby-sized altar. It makes me think that making Naruto Jinchuriki was his backup plan all along. He even had their chakras already put into the sealing formula. It's possible that because Kushina was too weakened, he only sealed half of Kurama back in her and the other half in the child Naruto.

I've wondered why Kushina couldn't be saved by resealing Kurama, and i think it's due to no (skilled enough) medical shinobi being present to heal her. It's possible that in the mirrorverse, either Minato defeated Tobi faster so she could still be saved, or a medical shinobi was present (tsunade?) to heal her.