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This is a biased analysis highlighting Naruto's qualities; As if the Kanzentai Susnao'o is the only valuable potential in Sasuke's reserve----in conjunction with Susano'o. You haven't proven that BSM Naruto can triumph Sasuke currently but rather to contrast a downplayed, speculative argument on the Susano'o against Manga scans on Naruto. I will however, respond to your conclusion as it holds the greatest merit in making an actual establishment on the matter.
The heat produced from Amaterasu was sufficient to reconstruct a cave, cause a Shinobi shrouded in armor suited for War to experience excruciating pain; when applied to BSM-Naruto, he roasts within the ignited Kyuubi shroud. The speed you speak of cannot be readily accessed as is entirely subjective. Even with it as well as the additions granted by Sennin Modo, Naruto got caught by Obito without difficulty as while hosting the entire Kyuubi shroud his movements are
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. Your idea then of speed and sensory abilities being weightier matters in a match between the two bodies [PS and BSM] is refuted. As regards the Underlined, you severely underestimate Enton's potential. At will, Sasuke can conjure any desired artillery to be used with the Susano'o be it Enton-Senbons or
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the Enton-Katana of the Susano'o it self to be used in a
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sword swipe to disperse all of Naruto's clones. Even more so, he could coat the Kanzentai Susano'o with Enton and ignite each of Naruto's Bunshin's individually. Surrounding Sasuke and utilizing continuous Biju Dama also wouldn't work as he could back fire them all simultaneously as: Firstly, the advanced perceptive ability of the Eien-no-Mangekyo would allow him to anticipate each Biju Dama and Secondly, Enton [through Susano'o] allows him to 'toothpick' all, once used in a similar fashion: [
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]. In short, Sasuke has the potential to negate all Naruto has to bring forth to the table, which in actually isn't anything uncommon or extraordinary:
-> Rasengan based Tech's.
-> Biju Dama.
-> Chakra arms.
As I said previously, had written that some time ago, and I hadn't a similar about sasuke(I wrote that in a reply to another person).
1- I never said naruto can take amaterasu directly. However, there are ways for him to evade the technique. Naruto BSM can either: dodge it(he has sensing skills that can sense chakra and danger, and a speed much higher than raikage's(Naruto KCM was able to surpass the raikage, naruto BM is faster, and BSM even faster) or make chakra projections to shield them(shown in the thread)
2-The speed is not subjective at all. In KCM and BM, he has shown considerable speed feats. BSM is even faster, due to to the senjutsu boost. Obito is the jinchuriki of the juubi, probably the fastest shinobi shown in the series(except for FTG). Besides, naruto BSM was able to track and sense the same obito(so did sasuke). His speed and sensing feats aren't futile them.
3- I'm not underestimating enton. Sasuke can indeed spin to try to get rid of naruto's clones with enton. However, this doesn't mean they'll stand there and let it them. Enton was countered before(madara with the black rods, even though his arrow is extremelly fast). Naruto BSM clones can just track the defense/evade mechanism I mentioned. If sasuke is atacking naruto's bushin on by one, he might be opne for atacks and comboes of other bushins as well as the original naruto.
4- Surrouding him is an option. Can sasuke sense all of the continous bijuu damas coming at him, even when used by clones? And even if he anticipate them all, it's not a fact that he might set them all with amaterasu in time before some can get the hit.
For how long can sasuke keep enton covering his entire PS? Because when the bijuu damas hit the susanoo, they'll explode. Even if amaterasu starts to burn it, they'll get unstable and explode.
So, sasuke's "potential to counter all of naruto's atacks" is limited to some points.