[Rias]

Lots of intresting and very promising theories but peroyasha and ace, but alot of stuff to read...I'm just gonna comment/speculate/theorize on some of the points, but do excuse me if I've brought up points that you guys have brought up/solved already:

Spoiler for 07151129:

Hmm...Matthew from Bible theory sounds pretty promising. However, as Peroyasha pointed out, the writer of the message, or who the message is aimed at, seems to be the problem. Also, looking at the TIPS for George, "０７１５１１２９。唱えれば、小さな黄金郷が、開かれる", does that suggest that it has something to do with the gold...? or the answer to the culprit?

However, thinking on that route,

Spoiler for Real/Fake Battler?:

I wonder if it is hinting on a "fake Battler". 0715 is something obvious and everyone knows, Battler's birthday. Perhaps 1129 is something that only the REAL battler would know? For example, Enje's birthday or something. Perhaps George/Kyrie noticed about a fake Battler? After all, boys can change quite a bit from 12 to 18.
There has been various points that makes Battler pretty suspicous in all 3 episodes:
Ep1: -Knows about the "Magical Circle of the Sun" at a time that was impossible for him to know
- Boiler Room...could he had allowed his accomplice to escape?
- He's the person to notice the letters in Ginzo's room, that ultimately allowed the other 3 to be killed.
- TIPS: "could've been a happy world for everyone, but thanks to him that world is no more" (something like that)...suggesting that he's the cultprit?
Ep2: -Shannon room: Beatrice said 全然駄目だぜ before killing off Shannon. Does that hints that Battler's behind it in the anti-fantasy sense?
-Letter again. Perhaps he put that so he has a reason to go somewhere else alone?
Ep3 -George and Maria doesn't seem to notice it's Battler until Battler self introduces himself...Jessica knows by Battler's way of speaking.

Spoiler for 6 "closed" room. Not "How?", but "Why?":

"Closed" room: Happened in ep1, ep2, and of course ep3. How the room is set up and the loopholes has been discussed over and over, but let's look at the other question. Why closed room?

Sure, the realistic answer is, "becuase it's a western-style murder mystery. Gotta have one of them closed rooms." However, what is it in for the culprit(s)? In ep1 and ep2, the culprit(s) gained the master key(s) and shifted the blame towards the servants. So in all, it was a pretty good idea. However, ep3 is different. Servants are all dead, master keys are in tact. The culprit(s) didn't seem to gain anything besides having everyone relocated to the guest house and barricaded themselves with guns.

However, that's when I realized...closed rooms were one of the biggest basis of "There IS a witch" or "There is a 19th person". That is, it has to appear that there is indeed someone outside pulling all the strings. Is this all just a smoke screen and there is only 18 people on the island (alright, accounting the whole "Kinzo was long dead" theory), or something else?