Okay, going through the episodes, and watching theories, I have thought a lot. I actually got scared cause the series seemed to have all it's questions asked all ready, but every time I delve into the series I find more questions, and realize just how little we know. Some things that we haven't even figured out yet! Also assumptions that have a bit of evidence but aren't entirely 100%.

1 As always, who is the mastermind.

People assume Felix, and there is a bit of circumstantial evidence for him being the reason all of this is happening. But how much do we really know? What did he do after the crash? He didn't tell Jack probably, maybe at some point he did and it made Jack go crazy. Jack decided to "Go missing" and devises a evil plan to bring his family back together. Of course that is a really long long shot given the fact Charles and Susan were killed, but we still have no idea. Maybe it's the Shadow Man? But I'll get to that

2 Who is the Shadow Man.

Again a lot of people assume it's Felix, some have said Sophie, maybe even the mysterious Chris character. I recently watched the Film Theory on this, and he points out something interesting. Instead of hearing "Shadow Man sees me, when lights go off" he hears "Shadow Man feeds me when lights go off" of course he mistakenly uses this with the "Might Rabbit" tape, but what if there is some depth to that? Someone feeding the animatronics, or maybe feeding Bon? Again a long shot seeing as how the assumed Hit List exists, but food for thought

3 Show bear, just in general

Who is he? Why do they exist, it's obvious they exist outside of Sophie's mind but, how? Again the film theorist brought up the possiblity of it being Jack, which may hold some truth but I'm not 100% sure

Anyways these are 3- WHAT IF SY05 IS THE SHADOW MAN???????? anaannnyyhyways just random thoughts, but I'm always up for discussion in the comments. I had more but I'm kinda lazy so I'll probably talk more later!