Now that I visualized it, should Yukari's abilities be divided into two? While conceptually similar, "gaps" and "boundaries" are still fundamentally different. The signature gaps like this one here certainly come from the fact that Yukari's a Sukima Yōkai. However, the outright broken ability to manipulate boundaries – that definitely came from elsewhere... perhaps from Merry?
The alternative would be assuming there are other Sukima Yōkai out there who can also manipulate boundaries. Not just Yukari.
