What their missions truly were, were not known. So it is hard to say that Radagast was not fulfilling his, he may not have been sent for the same reason Gandalf was sent nor Saruman. Alatar and Pallando must have been sent for something different as well. Radagast may have been captured by Saurons servants fron Dol Gulder too.
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*~*Call me a relic, call me what you will.
Say I'm old fashioned , say I'm over the hill.
That old whine ain't got no soul.
I'll stick to Old Toby and a Hobbit hole.*~*
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