Yuji Itadori is currently fighting against Sukuna ... And to do that, Yuji will have to defeat Sukuna. However, it is not necessary for Sukuna to be permanently put down even if Yuji does defeat ...

making him the perfect choice to defeat the King of Curses. Yuji was the spiritual nephew of Sukuna, as the twin that Sukuna ate in the womb was later reincarnated as Yuji's father, Jin.

In Jujutsu Kaisen, Gege Akutami uses strategic omissions to deepen character arcs, notably Yuji Itadori’s mysterious ... fan-favorite plotline (& it's not Sukuna's true identity) The Jujutsu ...