I agree that Aiwendil would have been all but useless in the counsel, yes he was an Istar/Maia but he would have been scarcely more productive than Bombadil [ though Tom would at least have been entertaining!]
Radagast in all liklihood only rtes[pnded to an emergency call from Saruman to go find Gandalf.
Radagast by JRRT's own account had withdrawn into a sort of tree-hugging eco-wizard, useful to his neighbors [and who knows Rhosgobel could not have been far from Dol Guldor - so maybe he was an observer of sorts] but not in the front lines like Gandalf, Aragorn, Glaladriel or Gondor, Rohan or even in the second line of defense [Imladris, Erebor, Lindion, etc] he had left the path of active resisitance against Sauron and gone native, but not anti-White COuncil.
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The dwindling Men of the West would often sit up late into the night exchanging lore & wisdom such as they still possessed that they should not fall back into the mean estate of those who never knew or indeed rebelled against the Light.
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