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Naruto and Boruto’s fandom is afraid that Sasuke's so weak now that he's lost the rinnegan that adult soccer could bust Sasuke's butt. But, the fandom may be overreacting.
Thinking that Sasuke’s strength is completely understandable. Sasuke fans are saying Sasuke has been done dirty the entirety of the series. In the time slip arc, on multiple occasions, Sasuke was always out of chakra.
Sasuke’s ‘always out of chakra’ – Rinnegan side effects
It's very important that we actually start with the whole thing of Sasuke is always out of chakra.
The rinnegan does come with a pretty substantial boost in power; we all can agree upon that. At the same time, it behooves us to look at the other drawback of having the rinnegan and how it applies to Sasuke. So, what's the drawback? You might be asking.
Well, the rinnegan itself comes with a pretty substantial strain on his actual body. To give you an idea of how much strain that had, Obito had Hashirama cells and Obito didn't even dare to have both rinnegan in his eyes because he admitted himself his body couldn't handle it.
So, when you look at the fact that Sasuke had a more advanced rinnegan eye, and Sasuke was using more jutsu to eat up even more chakra like the menoteji car like the inter-dimensional space-time ninjutsu that he had for those suzuki portals, that's your sign right there that Sasuke has a high chakra pool.
"If he gets Hashirama's cells, via that Hashirama cell arm that Tsunade made for Naruto, Sasuke can get a lot stronger".
A lot of people forget the fact that Sasuke already has Hashirama cells in his body. Kabuto gave him Hashirama cells, but Sasuke is already stronger than the other four Kage, which is very important because the other four Kage are criminally underrated.
Still stronger than the four other Kage
And all you have to do is look at the fact that they were keeping up with Kinshiki in all continuities of the Boruto movie. Whether it be the novels, whether it be the actual manga, whether it be the movie, whether it be the anime in the light novels, it is directly stated that Kinshiki was almost killed by the Kage. When Momoshiki was raising hell, the four Kage were getting taken out in one hit. We saw how fatigued Naruto in his base form was seeing attacks, reacting to attacks, taking multiple attacks that knocked out the other four Kage.
And right alongside of him was Sasuke, also taking more than one attack from fuse Momoshiki. With this, you actually got a small glimpse as to what base Naruto and base Sasuke could do in their current situations.
Sasuke and Naruto
Now because you saw a very clear power-up once Naruto went into his Kyuubi chakra mode and you saw a very clear power-up, when all of a sudden, Sasuke is matching Naruto's intensity, they kicked it into a higher gear. At that point, even if you depower Sasuke by a significant amount, he's still more powerful than four out of the five Kage, and he's still able to use some of his hacks like the perfect Susano, which a lot of people are saying Sasuke no longer has, but that's not true.
So, one thing you have to kind of keep in mind is that in the Naruto ninja escapades ova, he had one Sharingan and he was able to use the Susanoo in that battle.
When you look at the actual manga, one thing that we know is that moderation with no eyes was actually able to use the Susanoo. And a big part of the reason for this is that all these characters have one thing in common: they awakened the Sharingan in both of their eyes.
Sasuke still has his Susanoo, which means that you can still see Sasuke theoretically using this perfect susanoo and doing the same thing we saw in the ninja war, where Sasuke was using the Chidori and using ninjutsu, while actually using the perfect Susanoo. So, that in itself makes Sasuke extremely boosted.
Five changes in chakra nature
Sasuke is a master of all five changes in chakra nature, which means that Sasuke, now that he does not have the rinnegan strain on his body, Sasuke, in theory, should be able to start using more higher-level ninjutsu for a longer period in time without actually burning through his chakra so fast.
To have an idea of how overpowered Sasuke still is without his rinnegan, Sasuke in his base has genjutsu that is so overpowered that the dude is able to erase entire memories that took place in the time port. The genjutsu is so potent that this dude was able to make Naruto forget meeting his son almost 19 years in the past. That's arguably up there with what Itachi did with Izumi Uchiha, his lover he killed.
Itachi was able to make Izumi Uchiha live out an entire lifetime over 70 years in her mind and make her body shut down and kill itself making her think that she died of old age as Itachi's wife. What Sasuke did is arguably even more impressive than that.
Sasuke has genjutsu ability that you could argue easily surpasses anything Itachi did, but you could also argue that what Sasuke did with that 19-year long genjutsu that he used on Naruto to erase his memories isn't as impressive as what Madara did when he in chapter 606.
Madara was able to borrow part of the Giro Mazu statues power in order to create this genjutsu that was so outlandishly overpowered that he's able to actually change his actual appearance into his younger self, teach Obito all the specifics of the ninja world and the genjutsu, and train Obito to a point to where Obito is able to make Minato think that he's fighting the real Madara Uchiha.
So, you could argue that at this point, Sasuke's genji is not on that level but that's not bad. His genjutsu is arguably more advanced than Itachi's genjutsu but just short of.
We have enough evidence to say that Itachi's genjutsu surpassed his father. Fugaku's genjutsu was potent enough that he could control the nine tails, the full nine tails.
The only person we know for certain that actually controlled the full nine tails via genjutsu was Madara Uchiha, so if you say that Sasuke's genjutsu is just a smidgeon below moderates, that's still highly advanced.
In the Sasuke sunrise novel, where Sasuke is able to use genjutsu to the point where he's able to relate messages, he's able to use genjutsu to the point where he's actually able to peer into a person's mind and read through their actual memories. That was Sasuke in the aftermath of the fourth Great ninja war.
Can Sasuke still do flame manipulation?
When he was fighting against fuse Urashiki, Sasuke was able to use Amaterasu and then also wrapped the flames around his actual sword. It is evident that Sasuke still has flame manipulation because Sasuke's rinnegan was not active during that time.
Sasuke and Rock Lee
Without a doubt, Sasuke is gonna be more powerful than four out of the five Kage who were able to damn near kill Kinshiki in the novelization and did even better against Kinshiki in the actual anime format. We could all agree that Sasuke, between his genjutsu, his skills, his perfect chakra control, his high chakra levels, and Sasuke's own raw power, he's still second only to Naruto, maybe.
If Rock Lee has the eighth gate, Rock Lee probably surpasses him, but we don't know how strong Rock Lee is now as an adult.