Trying to think outside the box here, so some VERY random thoughts....
Is it significant that it was Player 23 who died and not player 19? There are 18 players in the game - so is there a role or significance to players 19-22?
MITO is a pool fan - so did he just pick player 23 because he doesn't like Emre Can? Is there meant to be some sort of devious clue in who he is?
Surely there can't be any significance in naming players 6 and 11 (AFC and Gerrez)? Is that one of the red herrings?
My view on it (just guessing as we're all in the dark here)
Player 23
Option A: I would guess Mito chose 23 in case there were a few guys joining the game late on. So he wrote his story up early and allowed for some late joiners.
Option B: The other theory is that we could have another 4 players joining the game, which would take it up to 22.
Since it's a hidden game I think Option B may well be the case, as MITO could easily have changed the 23 to a 19 if he wanted to at the last minute...
Choosing upstairs vs downstairs vs gardens
As for the other questions regarding upstairs vs downstairs vs gardens, I really don't think it's going to make a difference (at this stage i.e. day 1) which one we pick. If I remember correctly didn't MITO say on the sign up thread that it was a murder mystery type game that we have to try solve what happened, and we'll do so by receiving clues and then trying to interpret them?
I'm paraphrasing but that's the way I understood the game, we'll get clues every day and those clues will tell us something about what's happening. We'll have to solve those clues to figure out a way to escape the island.
If you look at the win conditions we have to find a way to escape the island AND kill the bad guys. So in my mind killing bad guys is done via the lynch vote (i.e. escape vote) as well as any potential actions we have (if there are vigilante/cop/etc. type roles), and the trying to escape part is done by investigating the clues we're going to get.
I might be totally wrong but that's how I see it.
So although I don't think that the vote for where to investigate is a major thing for today, I do think it's very strange that so many guys have jumped on the bandwagon I started of going upstairs. Some guys will have the same logic as me that it's a logical place to start, but there will also be guys who want to be seen to be posting without making any waves (staying under the radar), so going with the flow like this is also suspicious to me.