u/Acceptable-Gate-3510

Dabura is said to possess the same power as Sukuna in Shinjuku, and Yuji is said to be the greatest defense of Earth and humanity against this force.

Yuji was able to calibrate a Black Flash so as not to kill that guy.

He further refined his technique enough to avoid killing with his poison, although a single scratch could incapacitate someone.

This is even more impressive because Yuji could sense the presence of the Maru, Tsurugi, Dabura, and Mahoraga.

If Yuji is so accurate in how he assesses the other's physical capabilities, then it's correct to believe that Yuji could indeed defeat Dabura, since he says he would be able to handle him if Yuka lost.

Not only that, but the curses were afraid of Dabura, and Maru was able to sense Dabura's presence, but neither of them sensed or feared Yuji's presence, even though Yuji could sense them.

Therefore, Yuji's ability to calibrate his technique and his Black Flash directly implies the veracity of his statement about being able to handle Dabura..

Especially when we consider that even the curses had some idea of how powerful Dabura was.

So the premise is:

I: you can feel the strength needed to use your strength in accordance with the strength of the other person

I.1: Yuji possesses CE manipulation and CE vision equivalent to or superior to Gojo's.

I.1.1: Dabura could be easily sensed because of the extension of his power

I.2: Yuji saw and felt Dabura.

I.3: Yuji stated that he could beat him.

So Yuji could beat him.