Radagast the Brown

[Boromir88]

Radagast didn't really have any control what Gwaihir did or any of the Eagles. Radagast only sent Gwaihir with the intent to get news about Gandalf, which Gwaihir agreed to do, not to rescue him. Gwaihir rescued Gandalf because he was in Gandalf's debt, Gandalf healed Gwaihir from a poisoned arrow so Gwaihir owed him one. Also, Manwe was in control of the Eagles. However, if it wasn't for Radagast's sending of Gwaihir, Gandalf would have never been rescued. But Radagast only told Gwaihir to bring news about Gandalf, not rescue him, Gwaihir decided by himself to save Gandalf. I would have liked to of seen Radagast in the movies but I don't think he was important enough it would have only confused people.