Was ner'zhul (kil'jaedan) responsible for the original organization of the shadowlands?
Ie nerzhul is made into LK.
Told what to do, how to organize / envision this new miniature universe.
The primus was present, the depiction of death in 4 distinct categories
Then when Arthas put on the helm.
Nerzhul and Arthas mind in unison could work on developing the shadowlands. Both in means of pulling souls from the living into the death realm, but also the organisation/revolution of the realm of death.
Consequently bolvar puts on the Helm so as to best serve the shadowlands.
When sylvanas destroys the helm, she destroys the middle man controlling whoever they put in control down in the shadowlands. The trickle down responsibilities become amuck, and due to "time working differently in the shadowlands" we think these elaborate stories they speak of in the shadowlands as ancient historical tales, when in reality it just happened, just under a different ruler. The ruler of death serves the purpose of the realm of death, so its not their fault they are acting in a way rhat is against our own, it is just within their natural purpose to maintain order, towards the purpose of their role.
What was the shadowlands, before ner'zhul went in the helm?
Keep in mind during this entire time period, we now know the demons wanted Illidan to reach the helm, not Arthas, them having complete control over Illidan may or may not have been integral to their overall scheme, they just wanted things to oppose the natural order(a form of order they sought to create by creating the helm???). They also sorta wanted Illidan to be the light child did they not? More grand scheme this points to chaos wanting chaotic heads of life /death, the void wants ____ opposition? as the front of life and death?