Originally Posted by
Razion
Tangentially related to Nathanos using it to guide him at one point, Vash'j via Azshara, void invading all the realms and leaving fragments around to corrupt later, presence of the Light bursting at Revendreth, Anduin being influenced by void visions, and Alleria maybe getting involved with Sylvanas.
Void seems to want Sylv dead from the comic where the Windrunners met, but Sylv gave the Knife to Nathanos at one point and was helpful. So Knife may be fine with Sylv, but Sylv doesn't seem to have any interest or benefit in allying with Void or Knife unless it would be to hurt Arthas or break the system of Death. Maybe Knife can provide that power since it slammed into N'Zoth, and Old Gods famously seem to go outside the cycle.
So maybe there's something there.
But, generally I agree that Knife wouldn't be pertinent now.