The Balrog vs The Witch King

[Morthoron]

Originally Posted by Mansun

It is clearly obvious that knobody can be certain of victory in any contest in Middle Earth.

Yes, that is true perhaps, as luck and fate have a place in Middle-earth. But we are speaking with specificity regarding two Maiar who never battled each other before, nor is there any textual basis to indicate that they ever would.

Again, Morgoth's throne was there for the taking on a number of occasions. Why did Sauron assume leadership without a fight? It's not like Tolkien never wrote about kinstrife and civil war before (like among the Elves, the Numenoreans, the Arnorions or Gondorions). Why didn't a Balrog attempt to forcibly evict him? I am sure there was no allegiance between the two based on devotion or love (I can't see a Balrog being all warm and sentimental), so if a Balrog was as powerful as Sauron, why then was there no confrontation?