
Copy as Sure hit Idea
What if when using Domain Expansion against an opponent and yuta has no techniques copied or chooses to not imbue any of them into the domain, but only copy, it could result in something like using the opponent's CT as sure hit.
Aka an example: using domain expansion on Gojo, makes the sure hit the same as UV. Using it on sukuna same sure hit as Malevolent Shrine, and so. (this is an example im not saying yuta can actually land a domain sure hit on those two in a fight). Though its just for the domain and he doesnt get the technique after that.
Or another idea could be something like Copy makes Yuta's domain a nonlethal domain and instead automatically copies the opoonent's technique permanently without needing Rika to eat their body parts.
(Though if this was possible he would have just done this to everyone else during preparation to fight sukuna ig, but maybe something similar with different conditions and limitations could be possible)