Radagaisus and Radigost, both, are hardly new in Tolkien studies. As jallanite says, he mentioned them in his book which has been out now for a very long time, and there's a fair-sized note in Doug Anderson's Annotated Hobbit as well.
But I agree with DA when he says "Yet these similarities in name reveal nothing about Tolkien's wizard Radagast the Brown."
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The entire plot of The Lord of the Rings could be said to turn on what Sauron didn’t know, and when he didn’t know it.
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