Thematically, I believe that Sauruman, while fearful of Sauron, also wished to be the new overlord. That is why he created the Uruk-hai, sent them in search of the halflings (capturing Merry and Pippin and ushering them to Orthanc tower in Isengard - not Minas Morgul in Mordor). So, I would not play the evil forces as allies. They each have their own agenda and would each sieze power if they find the ring.
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