As usual, I'm probably sweatily jogging 8 miles behind the bandwagon, but these shots from Type Lumina seem like they might be relevant. I know a lot of @ChaosTheory123 scaling hinges on linking Arcueid to Exacaliber via their showings against Chaos Tide. I figure a canonical statement about the two powers being similar in origin can't hurt. She also has canonical wins against half a dozen Tsukuhime characters. So, more direct scaling should be possible now. If any over opponents were relevant. And Arcueid herself says that she wants to see who is stronger. Implying, at the very least, that she didn't clock Artoria as being drastically weaker.