now that I'm done with Land of Waves arc, I can confidently say that Kishimoto can't plan the grander lore for shit because of the implications Zabuza's and Haku's stories have on the greater history of Kirigakure and Blood Mist in particular
for one, of course the magical arithmetics - the manga states that Zabuza killed 100 of his classmates in the Academy exam 11 years prior to the current arc. a quick reference with the databook will reveal that Zabuza is 26 at the time of his death. meaning that a) somehow Zabuza was still in Academy at the ripe age of 15, not even a genin b) somehow everyone is surprised that a 15 year old murdered every single kid at the Academy exam c) 15 year old Zabuza in the manga looks younger than Team 7 and Haku combined
two, 11 years ago Blood Mist was a well-established regime of bullshit and murder. that's important for the grander lore because, if you remember this one funny fact - which is that no other Mizukage has ever been tied to Blood Mist except for Yagura, and when I say Yagura I mean Obito mind-controlling the guy - because 13 years ago Konoha was attacked by a mysterious masked individual and approximatelly 14 years ago a certain Uchiha Obito went missing after Iwagakure gang decided to show him why it's important to be careful when going into unknown caves. so our sweet little Madara cosplayer had somehow gaslit everyone in Kiri that yes, kids killing each other to become genin is a great idea!
and, once again, to anyone trying to say that the exam could have existed before Obito came about to power: the murder exam is explicilty tied to Blood Mist, and Blood Mist is tied to Yagura and we have no confirmation if anyone besides him was involved in that part of Kiri's history. oh, and Yagura could not have been a Mizukage before Obito started terrorizing the world 13 years ago, because of the little problem called Nohara Rin.
Nohara Rin died 13-14 years before the Land of Waves arc and, funnily enough, she died Isobu's jinchuriki. Yagura's other defining trait besides being the Mizukage in Kiri's darkest period of history is him being Isobu's jinchuriki and apparently having great control over his power. Why the fuck would he be a Mizukage without Isobu and looking like he's 15 at best even during the temporal ressurection? Obviously he wouldn't, so he isn't a Mizukage unless he's a jinchuriki. And he can not be a jinchuriki before Rin's death as that would create a paradox where he is the Mizukage and jinchuriki, loses Isobu, Isobu is sealed in Rin, Rin and Isobu die, Isobu returns, Yagura gets Isobu back, Obito does his first attempt at genocide any% and then Yagura dies. If you haven't noticed, the cataclysmic contradiction happens on step 2 - once Yagura lost the Isobu he's fucking dead and Blood Mist just does not happen.
ah, and let's admire the loving side of Uchiha Obito who would have watched the kids mass murder exam happen time and time again, did nothing (assuming he was not the one to introduce it lol) and the village only put an end to this bullshit after the exam ended not with 50% of the participants dead, but 99%. great guy, fantastic guy, I would trust this guy's ambitions in building a perfect world for humanity
but that's not all! I previously was unsure in my memory of Haku's backstory and if the Kekkei Genkai cleansings were an actual thing. yes, they were, and the official translation refers to them as "generations of non-stop war against those possessing kekkei genkai". I won't grill Haku too hard for using the word "generations" because no fucking way it actually was happening for this long, otherwise everyone in Kirigakure would have been fucking dead long before Yagura kicked it + he's 15 and has a skewed perception of how long something lasts. All his life he knew people like him are supposed to be feared and killed for their strength, so he's just assuming the same for the history (and kind of the rest of the world, judging by his reaction to Sasuke and assumption that the Uchiha clan died in a similar manner and not an internal political conflict)
Point is, from everything we know, this "war on kekkei genkai" is complete and utter bullshit. Kekkei genkai is how people become the strongest in their villages, and is the single most important thing each village has. Konoha was fucking built by clans with kekkei genkai, every major character from Iwa has a kekkei genkai, Kumo was constantly trying to yoink other village's kekkei genkai, Kazekages sand powers are all classified as kekkei genkai. Hell, Mei - who was a Kiri shinobi during Blood Mist and a future Mizukage post Yagura fall - has TWO kekkei genkai, while her buddy has a stolen Hyuga kekkei genkai. You get the point, there is genuinely no sane reason to have the population riled against people with inheritable busted powers.
And yet Blood Mist did. And yet Haku's father killed his wife when he suspected she had such powers. Now why is that?
The most charitable interpretation for a certain masked individual that I have is this was genuinely localized example of PTSD-related psychosis that created lynching incidents here and there in the Land of Water. Which does not answer the question of why Haku is so sure the world is out to kill people like him.
The alternative is as following: while terrorizing the city population by creating world's most murderously efficient system of promotion (which is absolutely in his control), "Lord Mizukage" has also encouraged a fantistic propaganda campaign against people with kekkei genkai and then sat on his ass and did nothing when those people obviously ended up getting lynched (also a decision completely in his control). Well, perhaps he was doing something, like rubbing his hands and whispering some grandiose bullshit about the cruelty and despair of this world as he usually did. As I've said, awesome guy, fantastic guy, everyone should look up to him.
Well, at least this is the interpretation that I came to based on the evidence that we are given in the manga. The shit Haku and Zabuza mention in their backstories is absolutely bonkers even by shinobi world's standards, but those two genuinely assume it's the same for the rest of the world, and, uh, guys, no, you're just the survivors of the most brutal regime in your living history. The systemized murders of kids had to have come from the top and was allowed to proceed with "Mizukage's" permission, and killings of the best potential shinobi in the country should have been prevented from the top because this literally harmed Kiri's interests, but nope, "generations of war against kekkei genkai" :)
It almost seems like the meaningless deaths of hundreds to thousands of people in Land of Water during the Blood Mist period was against the interests of the people there and yet would have benefitted a certain teenage terrorist who was controlling the Mizukage and really was not interested in one of Five Great Nations having any military capabilities, huh... If only he could avoid any need for confrontation and simply yoink the Tailed Beasts and finish the plan he and the old man in the cave had... If only there was a magical eye he could use for all that...
Nah, that can't be it. CHIEF, MORE DEAD KIDS IN THE ACADEMY.
Ahem, and, finally, the funniest thing among what is mentioned in this arc: why the fuck does Zabuza need Gato's money. He's collecting the funds for another assasination attempt on the Mizukage.
Well, it's kinda easy to guess who was the first attempt - Yagura, but that failed and Zabuza had to run away from Kiri. But this raises the gigantic question - WHY IS HE ASSUMING YAGURA IS STIL ALIVE?? No, genuinely, who the fuck are you trying to kill? If Yagura is still somehow alive during the Land of Waves arc, how the hell is Mei comfortably in power by Shippuden?? We're talking about Yagura getting fucking murdered (and that's exactly what would have happened to him after his wonderful rule. yes this does mean Obito is a complete and utter bum for letting the jinchuriki he had under control for like a decade die but what's new. he must have messed up in some form if Deidara had to come with him in Shippuden and scoop free-roaming Isobu out of the lake), Blood Mist coming to an abrupt end, an insane power vacuum that would have followed, Mei somehow taking the power in her hands and settling the country that had just got out of what Blood Mist was. This does not happen in 2.5-3 years of timeskip. And, let's be honest, if the tyranical Mizukage was killed ALONG with the Kazekage and the Hokage dying during the chunin exam, that would have been somehow mentioned in the story. Like, that's a BIT OF AN IMPORTANT event.
Anyway, Zabuza is a bum who's trying to kill the Mizukage (who happens to be Mei and she's just as anti-Blood Mist as he is) and haven't read a newspaper in his life because no one taught him how to read in the Academy