I suppose the reason Tolkein didn't mention Radagast more is that, first of all, Radagast was a MUCH weaker istari than Gandalf and saruman for sure, and I think he was also a lot weaker than the blue wizards. In Fact, he wasn't supposed to be sent to Middle Earth with the other four, but Yavanna begged Eru (or was it manwe?) to send him with the others. He was always the weakest.
Because of this, he couldn't play as big a part as gandalf or saruman (no way could he have tackled the balrog at khazad-dum, for instance) and also because he was so obsessed with the trees and birds and stuff: he wasnt too bothered by his mission. He wouldn't have been nearly as interested in the ring saga as gandalf and saruman, and even if he had been he wouldn't have been capable of making much of an impact.
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The 'hum' generated by an electric car is not in fact the noise of the engine, but that of the driver's self-righteousness oscillating at a high frequency.
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