Actually, since our suspects are already down to Skuld and Ven, and Skuld is likely to be Subject X, whoever the culprit is , we're guaranteed to get the drama-if it's Skuld/Subject X, Lauriam has to get past Lea and Isa. If it's Ven, he has to get past Aqua and Terra. Which I'm fine with either, but Ven would cause more shock value bc he has been dubbed as pure and innocent before the Vanitas split many times.And knowing Nomura, well....
Also, remembering your past, including you had a sibling before you die as a non-human? If this is Kimetsu No Yaiba we'd get 5 minutes of the actual flashback lmao.