Thinking about it, Satori seems like a weird choice for the stone. I would assume it'd be Okū. I guess Yatagarasu would be too unreliable? Or is Satori really that powerful?
Hmm... how about we assume that it's the impression? When thinking about the incident, which person comes to mind? And for the Subterranean Animism one, it isn't Okū that lingered for Reimu and Marisa – but Satori.
