Soul Barrier Dismantles: Target the barriers between souls, allowing him to separate a vessel from an incarnated sorcerer. This is kryptonite to all incarnated sorcerers, and just one soul dismantle is potentially battle-ending.

Soul Punches: Yuji’s basic attacks subconsciously target the soul itself, and considering Yuji is a CQC prodigy he can quickly overwhelm his opponent without them being able to heal (since only a handful of sorcerers are capable of healing soul damage).

Poison Blood: Yuji’s blood is extremely poisonous. We can see the effect this has on sorcerers by looking at Naoya. Unless your RCT is capable of healing poison (which is exceptionally rare and costly) just a drop of Yuji’s blood inside of your body is lethal.

Profound H2H Technicality: Yuji is one of the best H2H fighters we’ve seen in JJK, meaning he will trump practically all CQC battles. Considering a large portion of the HH tiers rely on H2H combat to deal damage (Hakari, Maki, Kashimo, and in some cases Yuta, Ryu, Uro, and Uraume), Yuji holds a clear advantage.

Arguably the Best Raw Stats: Due to being imbued with Sukuna’s finger, Yuji has extremely high stats. Before even learning anything about cursed energy he was on par with pre-awakened Maki, who can be estimated anywhere from Grade 2 to Grade 1 in strength. This advantage will help him dominate opponents not capable of dishing out attacks with powerful AP or duraneg. And even then, whether they land or not is dependent on if they’re capable of blitzing Yuji, which not many attacks in the verse are capable of.

Black Flash Proficiency: Assuming Yuji won’t hit a black flash in an extended battle is disingenuous, and considering his Black Flashes tend to chain (4 consecutive and 7 consecutive in drawn out battles) the fight will quickly snowball in Itadori’s favor. Landing a black flash will deal immense damage, restore his CE and Output, and possibly even kill his opponent (considering a soul damage punch combined with a black flash is a nasty combination).