well, if we go into the novels we see Kakashi using Quartza wich is basically Lighning + Earth.

man, Kakashi is my favorite character in Naruto, i wish we could have seen more of him before now, but it's not a problem for me. thanks for the chapter

making Hiruzen and Danzo suffer is allways fun.

well, it's not he needs an affinity to learn lightning, he already high mastery over wind, fire and earth, learning lightning or water at this point would make sense as Hiruzen and Kakashi both have gone the 5 masteries route, and he doesn't need to show how high his mastery over lightning already is, just need to ask some questions and suggestion as Kakashi is problably the guy with the highest mastery over lightning in the world? even eventually developing Purple lightning never seen before in the shinobi world. There's black lightning in Kumo but that seems more like an weapon passed from generation then mastery.

this made me think that maybe he should go ask Kakashi for some lessons on lighning release, unless he plans to do something against the Leaf and they start investigating everybody with lightning release i doubt Kakashi would comment with anyone about it, keeping Ninjas info a secret is kinda of an unspoken rule for allied shinobi.

well, here we a divergence from cannon, Blue hair Paper Style, if it gets to Jiraya he will know who it is and this might change the timeline, because at this moment he thinks the 3 of the rain that he trained are dead.

but then it falls to my other point, if he's so fast why Kumo doesn't dominate the world after he kills all the other kages with overwhelming speed, there was no one to stop Ay after Minato died and Itachi killed whole Uchiha clan that might be able to predict his movements with the sharingan.Water was in a massive civil war, Iwa had lost almost 10 thosand ninjas from the last war, Sand was never strong and they even atacked Konoha with Orochimaru out of desperation at some point, why would he not just go and destroy konoha upon the Uchiha death? if a specialized wind rank S ninja with multiple shadow clones can't counter him he could just kill ninjas and retreat until he destroys konoha, if they fortify with seal send tailed beast bombs until it breaks as konoha also don't have the nine tails. So that leads me to belive that there must be a way to counter him and Fujin is just exactlly that counter with his speed that might be able to react to him.

well, Sasuske lightning completelly countered Deidara entire life dedicated for a singular art, so wind should counter lightning just like that, it's not as if it would make lightning not the strongest element in in the world, it would just have some counters.

how does he dodge large large scale wind jutsus by multiple clones? like i said, wind jutsus dissipates his armor and he has to spend a lot of chakra to activate it again, in a battle of who last longer the Raikage having to activate his armor multiple times would lose. if the raikage speed is so overwhelming where he can dodge multiple large scale jutsus then how does Hiruzen would even survive in a fight against these guys? 3rd and 4th raikages. the other kages can fly and flee but that's not sustainable in a war as the raikage can just go for war objectives then, if there's no one to face him he can just go for whatever objectives he wants and retreat with enough chackra.

yeah, but do you get what i mean that if a rank-S wind user specialized in speed doesn't counter the raikage then wind countering lightning is a joke.

man, again with this, Fujin should be the biggest Raikage counter, if he can't counter him then the third raikage should be able to kill all the other kages, his lightning armor is dissipated by large scale wind jutsus, and as we saw in the war that Rasenshuriken would have killed the Third Raikage in one go if not for Edo, it dissipated his armor before hitting his body. And on top of that Fujin style revolves around speed, if he gets so outspeed by the raikage how would the other kages ever be able to compete?the raikage lightning armor is OP but if it had no counter Kumo would have dominated the world.

but that's not actually a fact, it's never said it's a simple yin manipulation jutsu, and no one other then a Yamanaka in the entire series of Naruto and Boruto was ever able to use it, it's not like there wasn't talented ninjas who would try to learn since the creation of the yamanaka hundreds of years ago in the warring states period. But i think i get what you mean that it's easy to learn in the the alternate universe that Fujin lives, and i can agree with you that in this universe of Fujin it's easier to learn by reasons of the author, but my point still stay, if it's easy to learn why don't the other villages or clans already know it in the hundreds of years of conflict that happend in the world, it being easy to learn would only make it easier to be stolen.

but that's my point, why would doing either of those be "easy", Ino can be just a genius for the minda arts to have learned her jutsu at 12, it's not like her generation had any normal kids, all of them were genius in their own fields of expertise, Sasuske, Naruto and Sakura were the only ones on another level enterilly considering the whole world.

you say the jutsu is simple just because Ino learned another jutsu that you think is more complex when she was 12 doesn't make any sense, for all we know the jutsu that Ino learned could be easier to learn then mind reading you just are assuming too much here and taking your headcanon as truth(Ino could be just extremilly talented in her clan jutsus as well), and on top of that there's the possibility of it requiring their bloodline to learn these jutsus, but i never broutght this up because that's an author decision, no one orher then the 3 clans ever used on of clans jutsus, Hiruzen using mind reading is an invention of the author.

well, if it was so easy the other villages would have it, making prisioners of war use it and learning wouldn't be that hard if it was so simple to learn it, the main advantages that made Konoha able to win all wars are the hyuga, yamanaka, inuzuka and aburame that have really strong application on wars. And Yamanaka secret jutsus have really strong points outside of war as well, stealing jutsus and intel, the other villages would problablly do anything to get them if it was so easy as watching someone use it.

it doesn't matter, 1 person researching something for 5 years at most doesn't beat entire clans and villages in research, and i don't even remember when he started doing it, it's been months since.

tbh, i think that if it was that easy to replicate the Yamanaka secret techinique the other villages and clans from warring states period would have done it already, learning it just by looking sometimes and doing some experiments with more or less 100 people with it being far from his focus over 3 years is quite strange, it feels too easy, not even the Uchiha or Hyuga stole it from them over the warring states period. Anyway i don't think it's very impactful Fujin knowing it, it would be really bad if that went to other villages, but i think it doesn't change much with Fujin.

is Hiruzen even worth saving? He's almost as bad as Danzo, just let that guy die, kill Danzo and make the other 2 elders irrelevant and then Konoha can progress with Tsunade, Kakashi or Fujin, whatever the author wishes to make.

this just reminds me of something, it's problably impossible to use the eight inner gates alongside Senjutsu, as Senjutsu requires balance and xontrol of tha balance, the violent discharge of chackra given by eight inner gates problably makes it almost impossible to control senjutsu, maybe only the first and second gates, but it sounds like too much stuff to concentrate on while fighting.

something that part of the naruto fandom theorize that would really strong is Tsunade punching with some of the gates openned.