look harder
Mito finds she loves all her children, and she adores her grandchildren, but Kushina is different. Kushina is her secret keeper, her living legacy, the only one who knows every secret Mito ever learnt, and she's given every power Mito can bestow; she maybe the jinchuriki but she will always be the woman Mito raised first. It is Kushina she tells her stories too, the ones that no one else hears, about Madara as a good man and Touka as a brilliant woman, about the way her lost brother breathed life into the few people around him to the extent that those closest found they couldn’t breath without him (she tells her about perfect makeup in battle and unceasing devotion to loved ones, about the man that raised a child even after he died).
She looks for every place that Tobirama touched and shows them to Kushina; she wants someone to remember him when she who is the last of them is gone. He was a good man Mito tells her, but that is not the only reason I tell you this. I have given you the power to break the world so you must first understand this; there is power in the unspoken heart and devotion is the greatest weapon of all. Take care of what you leave behind, and never forget the story of my brother. Kushina doesn’t understand Mito fears, but she has done her part and will greet her rest without remorse (Tobirama went without remorse too she thinks, and there are few deaths she would rather emulate).
She finds that the sound of the sea seems to reach up for her as she goes, and lets all that she has gathered to her drift away. Far, far, away she can hear a terrible battle, the sounds of her people dying, the roars of a fearsome beast, the heartrending sobbing of a lonely child, and the sound of Madara laughing through his tears. But she is beyond them and they recede from her as she fades from them and she finds