[Circular Logic]

Spoiler:

1. Who are those people in the white van?
2. What's the significance of the syringe?
3. What's the significance of whatever was in the storehouse, if any?
4. Why are the dead walking?
5. What are Ooishi's intentions?
6. Why do the girls turn psychotic?
7. Why do Mion's eyes change?
8. What happened to Rika & Satoko?
9. Was Mion REALLY the one responsible for all the Hinamizawa murders?
10. Who are Tomitake & Takano, and what was their purpose?
11. Why was Rena not killed in Watanagshi-hen?
12. Is the kantoku really connected as suggested in Onikakushi-hen? Or is he lying in tip #49?
13. If Satoshi WAS killed/disappeared, who was the other one, as with the rest of the Oyashiro-related murders? Or is this an exception?

Revised questions for #9. I'll update for 10