Byakugan is completely overrated. Thier best genius struggled like hell against a cursed seal user weaker than cursed seal Sasuke. Thier best genius. There is that, and there is this guy from the Uchiha clan who orochimaru claimed can learn and master all jutsu including the pathetic gentle fist and rotation, Lord Sasuke. Compare the filth of the hyuga with the worldly lord genius, Mr Sasuke.
Kaguya's abilities are the properties of all Shinobi in Nature. Its asinine to think only hyuga's have a part in it. Look at how kaguya was so desperate to get sharingan to cast the IT and get power. She felt the byakugan was pis s t oilet worthy in terms of power. That is why she desperately clinged on to the god tree HAHAHAHAHAHAHA.
Susano'O is a Spirit so don't get your hopes up, im becile.
If it was chakra, Hyugas would have beaten Madara long ago. Viz translation is the worst at translating databooks, the first databook translation which the Naruto wikipedia uses is this Susano'o + yata + totsuka
NINJUTSU; KEKKEI GENKAI: Susanoo (Mysterious, All-Encompassing Assistance Ability*)
User: Uchiha Itachi
Offensive; Defensive; Close, Medium, Long ranges; Rank: none
Main text
There are two doujutsu the use of which is allowed exclusively to those who have awakened to the clairvoyant eyes of Heaven, the Mangekyou Sharingan: Amaterasu, which speaks of Light and the material world, and Tsukuyomi, symbolizing the spiritual world and Darkness**. Only in them who hold both of those, dwells the power of the wild, rampaging god... Susanoo. The materialized chakra shapes itself after the wargod's commanding face and powerful physique, and the fierce spirit won't subside until the destruction of all the enemies in its line of sight...!!
There's a reason why Susanoo can boast perfect flawlessness in its offense and defense: the spiritual weapons it holds in both hands. The Sword of Totsuka* in its right hand, which will mow down any kind of enemy, and the Mirror of Yata*, upon which all attacks will bounce back. Substantial or spiritual, and then ninjutsu or physical attacks lose all kinds of significance before the god's efficacy. Captions
-In the pupils that grasp the principles behind Heaven and Earth, dwells the valorous sword-wielding, shield-bearing Aragami***!!
-Protecting its caster, it destroys the enemy!
-In its left and right hands are held the unparalleled, wondrous Sacred Treasures* of virtues miraculous.
Picture comments
-Only those who have carried mastery of Mangekyou Sharingan - the doujutsu feared by those around it as the strongest - to its extremes will come onto the god's territory. A guardian deity to its caster, it eats away their life at the same time.
-The sake flowing out of the gourd assumes the shape of a sword, becoming the Totsuka! In addition, the souls absorbed by it are sealed there.
-The Sword of Totsuka
One swing of the Sword of Kusanagi* has the power to throw the people it stabs into an genjutsu world of intoxicating dreams, and seal them away for eternity. The sword itself carries a fuuinjutsu.
-The Mirror of Yata
The substance-less spiritual shield. Endowed will all Nature Alterations, it changes its own attributes in response to the attacks it receives, making the jutsu ineffective.
Look clearly with your eyes open at the underlined. Susano'O eats the life of its user. How'll chakra eat the life of its user? When has using ninjutsu eaten the life of its user? Viz translation data book goofed up in its version. No wonder the wiki don't take it's crappy version for reference. Its written several times as a god and a spirit, god and spirit are synonymous in Narutoverse. Also the very words god's territory proves that the user after mastering MS enters a realm in which Susano'O exists and therfore summons it into the real world at the cost of getting his life eaten as a price offering for taking Susano'Os services.
Susano'o is a Spirit summoned by the user who eats thier life in return for helping them in battle.