I hope you realize that these are all irrelevant side characters that have not been important for the longest. Why the hell is Hinata any different from these guys? Because she cares about Naruto? Because she has special feelings for Naruto? Please.
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Before there was a Naruto series, there was Hinata as Naruto's Yin.
The Hyuuga embody Taoism - the very concept of Yin and Yang, the source of the idea for elemental chakras (and their relationship), and the foundation of everything the Naruto universe is built upon (even the concept of destiny and the Budhist Cycle of Human Suffering draw heavily from Taoist influences).
It only stands to reason that the Hyuuga lay at the end of the series, when the origin of Ninjutsu has been explained.
The powers utilized by Kaguya were not ninjutsu, nor were they ninshuu. Interestingly, we do not see the Hyuuga utilize ninjutsu. That is because they practice the arts that Kaguya used. Those are arts that directly manipulate the Tao, or nature energy.
Hinata was never a side character. Naruto and Hinata were literally conceived as two parts of a whole by Kishimoto. To even say that Naruto is the main character is somewhat incorrect. The main character is the Yin-Yang relationship between Naruto and Hinata - the destiny they share.
But you'll see in time. The next chapter will likely hint at (if not outright explain) the origins of the Hyuuga, possibly the Uzumaki as well. Though I doubt Kishimoto will so tactlessly tip his hand at the concept of shared destinies. That will be one left to play out.