[Kanon]

Originally Posted by Ka-el

Spoiler for 257:

Well so maybe that's why Sukuna had two extra arms, eyes and mouth, he ate his twin in the womb and maybe that's why he was an unwanted child, basically a cannibal before he was even born. Not only this, twins share cursed energy and so they are considered failure and bad luck among sorcerers. Maybe that's why Sukuna ate his twin, tso he wouldn't have been "incomplete".
Now, the doubt is about the CT, if Fuga and Shrine are separated techniques, perhaps Shrine was actually his twin's technique while Fuga was his own, or the other way around.

Spoiler for 257:

That's an interesting idea, I think that might just be it. It's as good an explanation as any as for why Sukuna has at least two completely different cursed techniques.

And damn, Yuji is a beast in this chapter. Black Flash after Black Flash. This should have canceled Sukuna's gains from his own Black Flashes.