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Mangekyou Sharingan Sarada
Sage Mode Mitsuki
8 Gates Metal Lee
The Demon Himawari
The Genius Shikadai
etc
Kawaki apparently killed or defeated Naruto somehow, but did he also defeat the others I listed? And what about Sasuke? The other shinobi of Naruto's generation? Sakura, Rock Lee, Choji, etc? And what about the hopeful 8th Hokage Konohamaru?
To me, this mystery is even more interesting than the mystery of Tobi's true identity.