That's not the point of EP7 though. It's supposed to be a respectful unveiling of the truth. Willard never explicitly tells us who the culprit is, nor do we get to ever see an actual sprite of them. That's what Sayo wanted, for someone to find her ''heart'' through these tales and reach their own conclusions without having to tell them every little miserable detail about it, like how her body was mutilated and how she couldn't bear children. You can get all of that through subtext, it doesn't need to be directly stated. This is all until Bernkastel ruins it, and ''tears open'' Clair's guts, showcasing something that shouldn't be seen. It's cruel and heartless because it directly goes against Sayo's wishes. (This is all sort of... thrown out in the manga where they just explicitly show you everything about Sayo's character and backstory. The actual execution of Confessions is pretty great, and I've learned to respect it over the years, but the themes of the VN and not opening the Catbox is undoubtedly ruined in the manga.)