Silly me, trying to discuss the plot in a section of the forum devoted to plot discussion.
There is a distinct difference between trying to discuss the plot and "Read the OP. That is all". You're not looking for discussion, you're looking for confirmation. When you don't get it, this is the result. Instead of addressing the issues one way or another, you dismiss dissenters with hyperbole. But let's do take a look at your premise, and the problems that I see with them, shall we?
The first issue you list is that nobody notices that the Divine is missing. How do you know? What access do you have to the game code that allows you to make this statement as if it were a fact? Do you have any information to support this claim, or is it that, in the heat of the moment, you decided that that's what is actually going on? Do link any relevant information that shows that your supposition is fact, I'd love to see it.
The next thing you bring up is the Divine being held, and then not held. You claim that this is impossible, despite what we see happen in the prologue, where Cory orders his adherents to kill the soon to be Inquisitor. When they shift focus from Task A to Task B, there are consequences to that action. That this is a probability escapes you, and is dismissed out of hand because reasons...
The next thing you present is instead of a statement, a question about the nature of the Orb, which, unfortunately, none of us really know. However, it would seem that it was integral to the creation of the Anchor, or why would Cory destroy Haven in an attempt to get the anchor back? Or, in order for your post to actually be relevant, do we have to disregard this?
The next thing is why Cory didn't post guards outside of the room? In this context, the answer is quite obvious, to me; he didn't want to draw any undue attention, maybe? Posting guards would surely not draw any attention to him, would it, especially when the Divine is missing?
The next thing is gagging the Divine? Why? If it hadn't been for the PC walking in on the ritual, it's game over for Thedas. Cory succeeds, and boom. The other thing here is, would there have been an explosion if not for the interruption? Do tell, how does that ritual work out if it's not interrupted, surely you've seen some youtube videos that show what happens if not for that? Can we, legitimately, claim that there was no "Divine Intervention"? Pun intended. Given how much we don't know about the Maker, who's to say?
All of this, however, is hinged on Number 1 in your position. How do you know people weren't searching for the Divine? How do you know, for example, that all of the potential PCs aren't actively searching for the Divine, and that the chosen PC is the one that finds her? We have no way to know what's going on outside that room.
Then there's the real issue with your whole subtext: We're actually physically in the Fade, gathering information from a Fear demon's minions. Do you understand the nature of fear? Do you understand that people that are afraid of spiders aren't afraid of giant spiders only, but are actually afraid of spiders that you can squish with a finger? So what we get can easily be distorted images of what actually happened. There are a myriad of ways that what we see isn't exactly what transpired, but what we were afraid might have transpired. Solas touches on this in one of his early dialogs: He relates the events of Ostagar from both sides of the Loghain was a traitor debate from these very forums. He then states that both of them are "real". That's the nature of the Fade, and, ironically enough, that's been the nature of the Fade since we learned about the Fade. It is shaped by dreamers, and the demons that control that particular section.
So sticking to the established lore is contrived. Of course, as the poster that you quoted that prompted this exchange pointed out, what work of fiction isn't contrived? It's fiction, it's all made up.