Regarding the situation of Tsunade. i dont think that kishi is planning to kill her. he make it look like she is, but i doubt it. one reason is, that he had a lot of chances to kill tsunade. Madara had a lot of oppurtunities to do that. example, when tsunade ran out of the upgraded mitotic regeneration technique and was about to be killed by madara. he sent dan to her to save her, meaning that he plans on saving tsunade. it would also be a bad idea to kill her because, no one in konoha will be from the older generation. the only one that would be left, if she dies, are the two elders that used to be the 3rd hokage's advisors. and we all know that both of them are not rightfully minded. as someone said earlier, it is the best time for tsunade, to probably show her sage mode, since she got that massive chakra from dan. kubo wouldn't have given her massive chakra for nothing. I mean he brought Dan by edo tensei, for that specific purpose.
Im confident that she will survive because..
1.) If she really intends to heal the kages, she might want to be in a better condition to heal them. which means she should have had katsuyu fix her first then heal the kages. However, she said that she wants to heal them first before herself, meaning that she is also confident that she can survive.
2.) Kubo won't let the third sage mode praticing place out for nothing. Our best guesses are that it's a place for slugs, and the only character we know that can use slugs, and has the potential of using sage mode is tsunade. He should show the slug sage mode because mentioning it would have been worthless.

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What do you guys think? Be nice..=))))