I think they made Saruman lead Caradhras because they wanted to leave out most of the "neutral" characters. In the book there's neutral good (Bombadil, Woses, Ents) and neutral evil (caradhras, old man willow, watcher of the gates). The watcher of the gates and the ents stay in the movie because they're spectaculare. Bombadil and Old man Willow were left out, Caradhras was laed by Saruman. I don't know what happens to the woses
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