so SPOILERS but
i feel like the killer for Sydney can actually be different in certain routes?? like for TJ it's Heavily implied that it's Chase (and kind of in Leo's route if i remember) but for Flynn, it doesn't specifically say it was Chase. I almost felt like it implied that it was Flynn (or whatever Flynn was at that point) instead. I'm not sure if that was the intention or not, but the concept that the killer changing each time is interesting.