Board Thread:Naruto Gaiden/@comment-32622248-20170719100834/@comment-25632268-20170728164235

Whitewing9709 wrote: That's also why the host dies when the beast is removed (with the exception of some Uzumaki Clan members because of their huge chakra resevoirs, Kushina probably would've lived if Kurama hadn't stabbed her)

She would survive only if she sealed Kurama inside her again. Which she wanted to do, but she and Minato had no knowledge that it would save her, they were sure Kushina will die anyway. Turned out as long as jinchuuriki still has contact with Bijuu's chakra, he/she can survive the extraction: Killer Bee survived Gyouki's extraction by holding to a tentacle.

Probably first thought of Edo Tensei Minato when he heard how to save Naruto: "Are you serious? I and Kushina wouldn't die if we went with her plan? I will never hear the end of it"