I know you've picked up the 'doesn't forward the plot' from Jackson, but MOST if not ALL characters, minor and major, further the plot of Lord of the Rings with their actions.
If it were not for Radagast, then Gandalf would have remained imprisoned in Orthanc, and just imagine the domino effect that would have. Gandalf himself states how important it was that he met Radagast, and that Saruman himself made the mistake of 'using' him in the first place.
What's more believable? A wizard passing on news to Gwahair or a moth? I know what I'd put MY money on.......
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