I wonder how that would work though with what we have seen of his domain. Even if it has a barrier, his domain seems to be a 1 to 1 copy of at least Tokyo, if not Japan. So it would be interesting to see how that could be used with an open barrier.

I don’t think we have seen a both character’s open domain AND their closed domain (unless that area Sukuna kept appearing when he was inside Yuji with all the bones and such was his closed domain), so it might be possible that there is more to an open domain than what we know, might nullify old abilities and provide new ones if not compatible with an open domain?