To me, what was most surprising was the bluntness with which Tolkien called Radagast a 'failure'. I had never thought of him before in those terms. But now given the context of a 'mission', of course that term is justified,
nevertheless even with other examples of fallibility, like Denethor II, Tolkien softened his judgment of them by a description of their challenging circumstances the presence of a Palantir, etc.]
On another side note, I would have liked to known more about Radagast's haunts. It mustn't extend far beyond Dol Gudur, if Treebeard is aware of Gandalf and Saruman yet not of Radagast, despite plants and animals being Radagast's special province
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