I think that all of us must eventually tread the bewildering paths of the HOME series. What you should first do though, is put less stock in what the movies say. The "fell voices" that Legolas hears in the Redhorn Pass are not Saruman, but independent creatures (which I struggle to make a description of, since one is not provided).
If I remember rightly, Gandalf even says something about the fact that not all evil creatures serve the Enemy. This also lends credence (Clearwater Revival) to the theory of the Independent Watcher. Very true, Iarwain that it may have been in need of food. A hungry Watcher would have been a great help to the orcs who destroyed Balin and Company, since they entered from the east side, driving the dwarves before them.
Arrh, Squiddy... arrhh...
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But Gwindor answered: 'The doom lies in yourself, not in your name'.
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