I'm not sure Sauron would be comfortable with Saruman - a rival - hanging on the mat. On the other hand, I can't see Saruman playing second fiddle to the other maia either - even if he were the Captain of the Forces of Barad-dur, he would still be #2.
On the other hand, as Saruman had just been humiliated by Gandalf, and as he's already stated that he would accept lesser-than-optimal means to an end, he might become a captain of the East just to get revenge on the hobbits, ents and especially Gandalf.
Thanks for replying.
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There is naught that you can do, other than to resist, with hope or without it.
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