I do not see a lot of grammar mistakes so that part is good but others?? Ohh boi, where do i even start. First, Tsunade only left Konoha nearing the end of second war because Dan die near the end of the third the reason being she is still there in konoha during Anko's cursed mark sealing flashback helping Anko with Hiruzen. Do u remember who is the same generation as Anko if not earlier? Kakashi and bunch meaning she still there during third war. So your baseless bashing of her in last few chapters left a bad taste. Yes Nawaki may died during the Second but not Dan. Also that means Tsunade is also at Konoha during Mito funeral, i mean seriously, u r forcing Tsunade who loves her grandparents way too much too out of character. Lastly, really, i mean really of all female character u chose Kushina, make no mistake, i like her and all but this also botched the canon future and i can not see the good point about it. Just way too idealistic. Plot armor is only in moderation plus doing your research about characters before u write them. Uzushiokagure case is a curious one since Kishi left a black hole in that plot in any case Hiruzen is the best military leader since he won two wars with scheming and all but he is a joke during peace time, i mean he won the second war when he do not have many SS class shinobi with him iirc only him and sakumo since the sannin were still young during that time only at the end they fought Hanzo and became famous and during the third war he prolonged the fight to nuture Minato and BOOM. He may have profitted from Uzushiogakure and Iwa, Kumo, Kiri war i do not see him selling info about the seals. Those three village only aim at Uzumaki clan because they want their bloodline and seal technique and being eliminating one of Konoha's main ally is a huge bonus to that. If Hiruzen knew about it quicker he can two pronged the villages and won it rather than prolonging it at the cost of its many shinobi lives.
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LIKETrue stuff, except for Uzushio. The villages attacking the Uzumaki had no interest in their not-quite bloodline nor their seals (which were incomprehensible to anyone but Uzumaki anyway and therefore useless). The sole reason was to wipe out what was close to becoming the fifth great village. A great village that was extremely closely allied with Konoha and strong enough that even as a minor village took the multiple invading armies and jinchuuriki with it into death. Uzushio was an existential threat to the villages that are aggressive, which is why those villages are the ones that ganged up on it.