The Balrog vs The Witch King

[Morthoron]

Originally Posted by Mansun

Because Sauron dared not try to evict the Balrog from his realm, no more than he did not with Shelob.

Please present textual evidence to indicate Sauron wanted to evict either the Balrog or Shelob, or that he was afraid of them for that matter; otherwise, your argument is baseless. In fact, in the Two Towers I recall that Sauron was certainly aware of Shelob, but left her alone as she was useful in guarding the pass at Cirith Ungol. He even sent her unwanted prisoners from time to time. That doesn't sound like an adversarial relationship to me.

Originally Posted by Mansun

The Balrog itself was not created with a view to dominate the world as a leader, but as a servant subdued to the will of Morgoth alone. I would compare this to the Witch King, soley commanded by the will of Sauron.

The Balrogs were not 'created' to be subservient as you mistakenly imply. They were Maiar just like Sauron, Gandalf and Saruman. One Balrog, Gothmog, led Morgoth's armies, so they had leadership capability.