Possibly. But the palantir are definitely out, for there are only 7 of them, and they were all accounted for. I think it is really their will being bound to Sauron's, for they know all of his plans. When Sauron felt the Ring in Mordor, the Nazgul flew hurriedly towards Mount Doom, for they knew exactly what they should do and what his will calls them to do. While for the others, it seemed that they were confused because Sauron's will "left" them.
That is just my opinion, though.
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