@Draphsin:
You are only reiterating my initial point that The techniques themselves are not prior stages of Susano'o; but the user must have unlocked both Amaterasu and Tsukuyomi before Susano'o surfaces [
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]. Sasuke rightly notes Susano'o as the third technique as the First and Second are evidently Amaterasu and Tsukuyomi [
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], he is merely citing Itachi as he himself had little knowledge of the Doujutsu, illegible of the fact that it brings about the attenuation of eye sight [
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] You are trying to take a section of his statement out of context to prove your point, but when read in totality it is in accordance with Itachi's and the Databook, which nullifies your point about shusui being a Susano'o user.
The Totsuka Sword is a conjuring under Itachi's Susanoo jutsu itself. Yata follows suit. Selective manifestation of all Susanoos by volition is kind of an example of that. It's akin to defining shape for a specific purpose; yet, applicable to Itachi's Susanoo on that end of both items, just like Sasuke displayed with the bow and enton variant; Madara his swords.