About the Kakashi Anbu Arc...
Specifically, the anime filler arc in the final season that explores Kakashi’s life post-Kyuubi, pre-Team-7. First of all, I actually really like this filler arc. It fleshed out several character relationships (not least of all, Kakashi and Yamato/Tenzo/Kinoe) as well as the dichotomy between Danzo’s Root and the Hokage’s Anbu. There was action, political intrigue, Kakashi being a badass, Kakashi being vulnerable, Kakashi interacting with baby Yamato and baby Itachi...plus, I’m a sucker for glimpses into Root’s culture. Sure, there were some flaws, some plot holes, but for the most part, they were relatively minor in my mind.
Except for one.
The plot to assassinate Hiruzen.
I have several problems with this whole plot thread. Let’s take a look, shall we?
First, a quick recap: In this anime-only filler arc, after the Kyuubi attack, teenage Kakashi was left grieving, angry, alone. Along comes Danzo, giving him someone to blame for the tragedy: Hiruzen. It was Hiruzen who ordered all the young Shinobi (including Kakashi) to NOT interfere during the attack; if Kakashi had been allowed to fight, perhaps things would have turned out differently. Danzo then makes Kakashi an offer: Work for him. Spy on Hiruzen. Help Danzo put Konoha back on the right path.
Kakashi, in his grief, agrees.
So we see him passing along information to Danzo for a bit...and then, Kakashi comes across a Foundation kid with a supposedly extinct ability: Wood release. Put a pin in that - it’ll come up again soon.
Anyway, eventually, Kakashi becomes part of Danzo’s plot to assassinate the Hokage. However, Kakashi has a change of heart and instead warns Hiruzen of the plot. Danzo is thwarted; Hiruzen confronts him...and then essentially forgives him. Hiruzen tells Danzo that if he ever found the individual responsible for the plot, he would have every right to charge the person with treason and execute them...but he’d rather that person instead focus their energies on protecting the village.
Some issues.
1. It was unnecessary from a story perspective.
From a story point of view, the assassination/double-cross subplot is supposedly what made Kakashi turn “back to the light,” so to speak. But here’s the thing: I don’t think that was the reason he turned on Danzo. It’s not that I think Kakashi was perfectly fine with the idea of assassinating the Hokage; it certainly contributed, I imagine. However, given the trauma in his life so far, especially being forced to kill a friend for the sake of the village, I think the Kakashi of this time had resigned himself to being a tool of assassination. If killing the Hokage was really the best thing for Konoha - as Danzo said it was - then he was probably prepared to do it. (Or at least believed he was.)
However, something else happened during this time that lead Kakashi to doubt Danzo’s intentions: Kakashi discovered that Danzo was hiding a Wood release user. It’s significant to me that Kakashi investigated the matter BEFORE deciding to tell the Hokage about Danzo’s plans. Hiruzen bringing up that Wood Release was one of the only ways to subdue the Kyuubi made Kakashi think: That ability is more important than ever in the village now. Why would Danzo be keeping it hidden away if he truly had the village’s best interests in mind?
TL;DR: Kakashi already had the doubts he needed about Danzo. An assassination, while certainly good for drama, wasn’t completely necessary for him to turn on Danzo. Plus...
2. The aftermath is VERY problematic.
There are two sides of this: Hiruzen and Kakashi. By allowing Danzo to get away with a thinly veiled warning, they both wind up looking at naive and/or horribly negligent - and well into the future, in Kakashi’s case. Hiruzen giving his old comrade the benefit of the doubt despite trying to KILL him...that’s one thing. I mean, I’m generally a fan of forgiveness, but this is extreme, even for me.
But Kakashi knowing about all of this, and NEVER bringing it up, say, to Tsunade? Or the Elders? (Not that I have the highest opinion of those two windbags...) Staying quiet about it while Danzo took power? I know, I know - Kishi didn’t actually figure this whole filler arc into the story. But do you see the problems it creates in hindsight, especially for consistent characterization? It makes Kakashi, a character defined partly by his intelligence and judgment, seem at best an idiot and at worst willfully negligent. A lot of the filler arc adds to his characterization and shows his growth (though most of that is focused on Kino-Tenz-Yams). But this? This takes away from it. It doesn’t make him flawed; it makes his actions (or lack thereof) reprehensible.
3. It could almost be seen as “out of character” for Danzo. (Yes, I’m serious.)
Yeah, we get it, Danzo is power-hungry and has wanted the Hokage hat ever since Tobirama tossed it to Hiruzen in the middle of a mini-war. He regularly undermines the Hokage office, acts on his own without the Hokage’s approval, and utilized shady, sometimes illegal means for his ends. He even holds his own forces back from assisting during Pein’s assault - while you could debate how much help they’d really have been, it’s still possible they COULD have saved at least a few lives. (...which would have been resurrected anyway, but let’s not open THAT can of worms.) Danzo has certainly committed egregious acts of subterfuge and sabotage.
But if he’d wanted to simply kill his way to the Hokage seat, he’d have done so long ago.
I put forth that assassinating a political figure of his own village was NOT in Danzo’s character, at least at that time. Assassination of a Konoha official is messy, risky, blatant. And it might not have even worked! Danzo would still need to be nominated, then chosen as the prime candidate, then approved by the Daimyo, then voted in by the Jonin...there were (apparently) quite a few hoops to jump through. Simply killing off the current Hokage wouldn’t have gotten all the work done. Heck, since the Uchiha clan was still around at the time, and I somehow doubt he had the best relationship with them in public, he’d have had a HARDER time getting the political support he needed.
(Huh...come to think of it, that COULD be part of the reason he wanted to get rid of the Uchiha clan...hmm...)
Point is, Danzo as he’s presented in strict canon is an opportunist, a reactionary, and frankly, a coward. From youth to old age, he’s preferred to stay back and let things play out around him, then take advantage of the outcome. We see this when he fails to volunteer himself as bait for Shinkaku and Ginkaku; we see it (in filler, but still) when he hesitates to put himself or Orochimaru forth as a Hokage candidate, post-third-war. We see it again when he keeps his troops from fighting Pein. Considering all of this...would he really be so bold and direct as to kill a Hokage?
“But the whole point of the failed assassination and Hiruzen’s forgiveness of it is that it made Danzo prioritize the village over his own ambitions!”
He still prioritized his own ambitions after that. He kept Root going in secret so that he’d have his own personal army. He continued to undermine Tsunade, trying to assassinate Sasuke without her knowledge. And again, there’s his purposeful inaction during the Pein attack. He may have convinced himself that he was only acting in the village’s interests, but he still prioritized his own.
Conclusion and caveats...
So, from a plot perspective, I kind of understand why they needed something other than the whole “Danzo’s hoarding a Mokuton user” thing for Kakashi to bring to Hiruzen at the start. I can see 2 uses for it:
A) It helped Kakashi prove his ability to judge situations for himself, thus making him one of Hiruzen’s most trusted Anbu operatives.
B) The writers wanted to save the Mokuton reveal for later - after “Kinoe” became “Tenzo” and had his own life-changing encounters that prepared him for leaving Root. After all, once Hiruzen was told of Kinoe/Tenzo’s existence, it became necessary to pull him out of Root. (I’ll admit, my memory on the timeline of this arc is a tad fuzzy...I can’t recall if Kakashi had already told Hiruzen about Kinoe before or not...and I’m too lazy right now to check.) Anyway, if they had Kakashi tell Hiruzen sooner, we might not have gotten the whole “Tenzo”/smoke-clan thing, or the whole “to kill Kakashi or not to kill Kakashi” thing, both of which wound up shaping Tenzo.
But I still think the assassination subplot made less sense than it attempted to make.
Also, it’s a tad inconvenient for certain aspects of my own fic, soooo yeah. There you have it: the real reason I want to retcon it :P