Possible memories of Kouichi being in Yomiyama have been erased, and now a death outside of Yomiyama, as shown in this episode.
Looks like for this class 3, it can be anyone.
I still believe Reiko is the Another.
-Kouichi's Memories and past in Yomiyama erased, even after he's confirmed to exist.
-Matsunaga asked if he had seen her recently, but she denied it.
-THAT BIRD, "WHY REIKO, WHY?"
-The Phenomena followed them OUTSIDE of Yomiyama. I'm willing to bet it's only because she was with them.
Oh, and I think the dolls are just a representation of how people die. They haven't had much importance, and I don't think they will begin too.