Heya — we don't typically retcon TDM threads, since most threads we do have plot impact and are used for clue submissions.

eta: okay, just took a look through all the thread submissions, and it doesn't seem as if anyone used a thread with Zhou Zishu to get their clues, so at least that's more facilitating. If your thread partners agree to retcon, it should be fine — if they express concern over any investigating they did while threading with you, we may need to come up with a different way for them to get that same clue or investigating experience.

Tell them to get in touch with me, if that happens, and I'll see what I can do, so they don't have to lose their clue.