I don't think it's an unrankable issue because RC didn't have any rules about finisher in Inner Oni. After playing it twice and hitting them easily, 1/4 finishers are playable imo. Keeping them is fine for me.
It just doesn't make sense imo to overmap this pattern when it's the only instance of it and isn't done in the oni... It's ambiguous in the first place whether it actually is a 1/7th or 1/3rd