Blinded, Dead, Faceless: The Popular Theory That The Night King in 'Game of Thrones' Was Not Killed by Arya Stark

All men must serve. All men must die.
The eighth season of Game of Thrones concluded one of the series' most intriguing story arcs — the battle with the Night King. But instead of a final duel between Jon Snow and the ancient evil, viewers got a lightning-fast ending: Arya Stark emerges from the shadows and with a single precise strike of a Valyrian dagger destroys the age-old threat. Epic, yes. But is it logical?
Chekhov’s Gun?
Arya — a beloved heroine — her sudden victory over the Night King felt like a trick on expectations. Neither Daenerys with her dragons nor Jon Snow, whom the series had been building up for this mission from the start, appeared in the final scene.
The prophecy about the Prince, Azor Ahai, who was promised, also turned out to be false. This sparked a wave of debates and... gave rise to a new theory. What if the real Arya lost her face?

It Was Not Arya
Some fans claim the real Stark died back in Braavos. The blinded, faceless Arya was replaced by the Faceless Man — the mysterious assassin from the House of Black and White, who took her appearance, a ruthless killer capable of defeating even a necromancer.
If this is true, her sharp change in character makes sense. Arya, returning to Winterfell, acts as if she feels no pain, fear, or attachment. Even with her family — Sansa, Bran, and Jon — she seems to be playing a role.
Faceless Men vs. The Night King
Could the House of Black and White have sent their agent to destroy the Night King? Very likely. Their philosophy is serving the Many-Faced God, the god of death. And the Night King is the walking denial of death.
He raises the dead, destroys the natural order. For the Faceless Men, this is heresy, the main threat to their order, and eliminating such an anomaly is a sacred mission. The order could easily have sacrificed Arya, potentially their strongest follower.
Illogical Scenes Become Logical
Why did Jaqen H’ghar let Arya go so easily? Because her mission was complete.
Why does "Arya" leave at the end of the series to explore unknown lands? Because the Faceless Man completed the task.
Why does Sansa feel threatened by her sister? Because in front of her is not Arya, but someone else — and a sister’s heart senses this. Add to this the stash of masks. When would Stark have acquired them?
Perhaps the whole finale was a deception
If this theory is true, Game of Thrones turned into a very different game, where beloved heroes were just pawns — and Arya did not save the world.