The drow statues are a great example of change. Originally, they were led by a female drow named Commander Maz'ri, but could only be interacted with in a hostile manner.
This has obviously been changed to give the player some information about Grymforge, and to provide a piece of a staff that's supposedly legendary. (The only thing legendary about that staff is how weak it is!)
So. There are going to be necessary holes going forward, at least until full release, and hopefully not thereafter.
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It seems to me that the best we can do is try to figure out where the best story beats are. That's where the writers will naturally end up.
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One note about Grymforge, it wasn't created by Ketheric. It existed before the Sharrans came. They added to what was already there and took it over as their own.
We don't know who predated the Sharrans.
But we do have reason to believe the Sharrans were attacked by some sort of hellish force. I suspect this attack was somehow in line with the origin of the Absolute.
