Yes good point, perhaps it was the power of something greater than the Ring or Sauron or The Witch-King that kept the Ring from possessing the Wight. After all was it not said in the Silmarillion that everything is part of the plan of Eru, much of which will not be understood but will add to his glory once complete?? Just an after thought mind you, as well as a stab in the darkness,so to speak.
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