I’m beginning to think the Totsuka sword and the yata mirror originated from a variation of a perfect Susanoo. It is never actually said the weapons were separate, the databook makes no clear distinction at all, and the only reason we dismiss it, is because of Orochimaro and Zetzu- they both commented on the legendary weapons without knowing about Itachi’s full form.
Madara’s sword:
As you can see, his sword is not an ordinary one. It literally has the power to break all creation, which we had a taste off when he cut through the mountains like a hot knife through butter. He can change the entire landscape, by the way, so could Hashirama which is why VOTE look like it does now. This is simply not a default susanoo sword, and it wouldn’t make any sense if any of other perfect Susanoo variations lacked something, at least, remotely close to that overwhelming power, which leads me to Itachi’s weapons which I think he had all along but, he was not the first one who had them. ..
This is what the Databook says about Susanoo:
Orochimaro and Zetzu both knew about the weapons, because someone else made them famous before Itachi. Someone else had similar chakra to Itachi and managed to unlock full susanoo, that person (could be plural, but I doubt since susanoo is rare) was a former uchiha who lived before Orochimaro’s time. We have already seen different users with amateretsu, tsukuyomi, etc., and as clan you would think that they would share the same techniques since they share the same bloodline.
Madara’s sword:
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As you can see, his sword is not an ordinary one. It literally has the power to break all creation, which we had a taste off when he cut through the mountains like a hot knife through butter. He can change the entire landscape, by the way, so could Hashirama which is why VOTE look like it does now. This is simply not a default susanoo sword, and it wouldn’t make any sense if any of other perfect Susanoo variations lacked something, at least, remotely close to that overwhelming power, which leads me to Itachi’s weapons which I think he had all along but, he was not the first one who had them. ..
This is what the Databook says about Susanoo:
Susanoo¹ (須佐能乎)
Ninjutsu, Kekkei Genkai, No rank, Offensive, Defensive, All ranges
User: Uchiha Itachi
Protecting the user, destroying the enemy!
[picture of Itachi's Mangekyou Sharingan]
→↓As the strongest doujutsu, only they can reach it who have taken the "Mangekyou Sharingan," feared by those around it, to its extremes. A godly state. Its the user's guardian deity, but at the same time, it consumes the user's life.
[picture of Itachi surrounded by Susanoo]
Dwelling in the eyes that grasp the truth of Heaven and Earth is a valorous sword-wielding, shield-bearing fierce god!!
The two doujutsu that only those who have activated the "Mangekyou Sharingan" are permitted to use~~ "Amaterasu²," denoting the "light of the material world" and "Tsukuyomi³," symbolising the "darkness of the spiritual world"~~ Only those who have activated the "Mangekyou Sharingan" -the heavenly eyes that see without obstruction the truth of all of creation- are permitted to use these two doujutsu. Dwelling only in those who have grasped both of these technique is the power of a tempestuous god... that is "Susanoo". The materialised chakra takes on the form of a war god with a commanding face and powerful physique. His fierce soul will not calm down until he has destroyed all enemies before his eyes...!!
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There is a reason "Susanoo" boasts absolute perfection in both offence and defence~~ That reason is the "Sacred Treasures*" he holds in both hands. In his right hand is the "Totsuka Sword"** that will strike down any kind of enemy and the shield in his left hand is the "Yata Mirror"*** that will reflect all attacks. Whether they be material or spiritual, ninjutsu or physical attacks, they all lose their meaning before this god's potency.
[picture of the gourd as the Totsuka Sword appears from it]
↑Sake flows from the gourd, taking on the shape of a sword and transforming into the "Totsuka Sword"! The souls absorbed by the sword are also sealed in there.
In his left and right hands are the unparalleled Sacred Treasures of miraculous efficacy
The Totsuka Sword
[picture of Orochimaru being sealed into the Totsuka Sword]
←It's a type of "Kusanagi Sword*," equipped with the power to throw the person it stabs into a genjutsu world of drunken dreams, sealing them for all eternity. The sword itself carries a "fuuinjutsu".
The Yata Mirror
[picture of Susanoo holding up the Yata Mirror]
→The incorporeal shield of the "Sacred Treasures". Endowed with all "nature transformations," it can change its own characteristics depending on the characteristics of the attack it receives, making the technique ineffective.
Orochimaro and Zetzu both knew about the weapons, because someone else made them famous before Itachi. Someone else had similar chakra to Itachi and managed to unlock full susanoo, that person (could be plural, but I doubt since susanoo is rare) was a former uchiha who lived before Orochimaro’s time. We have already seen different users with amateretsu, tsukuyomi, etc., and as clan you would think that they would share the same techniques since they share the same bloodline.