Sukuna's original form's return may also impact Yuji's body, granting him a novel strength.
As the Jujutsu Kaisen manga nears its climax, the conflict with Curse King Sukuna intensifies, with Sukuna evolving and defeating sorcerers obstructing him.
Recently, Sukuna achieved the unimaginable by eliminating the strongest sorcerer, Gojo Satoru, with a technique that literally slices through dimensions.

A recent chapter saw the powerful sorcerer Hajime Kashimo fall to Sukuna, following Sukuna's reversion to his original form.
Observing the downfall of sorcerers to Sukuna, Yuji Itadori and Higuruma Hiromi join the battlefield in Jujutsu Kaisen chapter 238. A notable detail is Yuji's arm, which appears evolved, possibly hinting at the influence of Sukuna's previous residence within Yuji.
Sukuna's Impact on Yuji's Physiology
Sukuna's extended presence within Yuji might have consequential effects on his body, with Sukuna's cursed energy potentially lingering in Yuji post-departure.

The residual cursed energy from Sukuna within Yuji could resonate with Sukuna's entire being and soul, thus affecting Yuji's body upon Sukuna's return to his original form.
Sukuna's original form restoration involves altering his soul's shape, suggesting Yuji might similarly be adapting his soul to emulate Sukuna and become an ideal jujutsu vessel.
Absorbing Sukuna's cursed energy and consuming cursed items may have led Yuji to develop a new cursed technique, as indicated by his evolved arm in the latest chapter.
Yuji Itadori's New Ability: Soul Manipulation
Mahito's remarkable ability allows him to modify his soul's shape for enhanced durability and power.
In their initial encounter, Yuji managed to harm Mahito's soul, a feat even Nanami couldn't achieve.

Yuji holds onto Yuki's research on souls, hinting at his deep understanding of soul concepts, possibly deriving valuable insights from the studies.
Speculation abounds that Yuji might be capable of swapping souls with others, a form of soul manipulation, as suggested in chapter 222.
Armed with profound knowledge of souls, Yuji might leverage this to craft a superior vessel, potentially enabling him to confront and possibly counter Sukuna.
The question looms: Can Yuji Itadori triumph over Sukuna?
The impending battle between Yuji Itadori and Sukuna remains uncertain, making it too early to judge Yuji's capability to defeat Sukuna.
Should Yuji retain any of Sukuna's cursed energy, it might offer him an advantage in the duel against the Curse King. This is akin to Gojo's experience using the Purple Hollow technique against Sukuna, where Gojo incurred less damage due to his own cursed energy.

Employing this logic to Yuji's conflict with Sukuna suggests Yuji might suffer less harm due to the residual cursed energy of Sukuna within him. This resilience could allow Yuji to hold off until help arrives or even evolve to a point where he can defeat Sukuna.
Although this advantage may not decisively eliminate Sukuna, it surely enables Yuji to inflict substantial damage on the Curse King.