As far as I know from UT, none of the Istari but Gandalf could have returned to Valinor even if they wanted to, because they didn't properly fulfill their mission (i.e. Saruman was corrupted, Radagast turned away from conflict with Sauron to communicate with animals, the Blue Istari went into the East and apparently ignored Sauron altogether). This ban concerning Radagast strikes me as rather strange. While he didn't take a really active part in fighting Sauron, he did enlist the animals to spy against him (even if this goodwill was skewed by Saruman). I don't see any clear reason for him not being allowed back into the West. Of course, the tales were unfinished, as the title suggests, so I'm guessing this bit was simply passed over with either a plan for explanation or just not that much thought. Tollers was a rather busy guy, after all. Little help here?
Another thing... just me spazzing: the Istari were chosen by Yavanna (Radagast), Manwe & Varda (Gandalf), Aule (Saruman), Orome (either Alatar and Pallando or only Alatar) and? Mandos & Nienna (Pallando?). The thing that is most notable about this arrangement is the lack of an Istari chosen by Ulmo. It is said that he was most aware of what passed in Middle-Earth, and thought always of the people there, even in dark times. The sending of the Istari represents this same idea, so it's rather strange to me that Ulmo didn't get a representative (never mind that he is far and away my favourite Vala...). Could it be because he seldom came to Taniquetil? But wouldn't Manwe summon him for something so important? All very strange...
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