If I'm not mistaken there's a whole thing about how we don't know what Sukuna's cursed technique actually is right??? (I'm begging I didn't dream this can't i genuinely can't remember)
I want to take a guess with what i know and say it's something to do with absorption- so he can kill someone and absorb their cursed technique and use them as he wants to. You could then interpret Malevolent shrine as like how you offer up things to shrines of a god- It would be giving up your CT to him?
I might need to sleep on this idea- metaphorically and literally it is 1am as I'm thinking about this.









