Radagast byl poslán, aby vykonával podobnou roli jako Gandalf, ale ptáci a zvířata ze střední Země se příliš rozptýlili. Z Nedokončené příběhy :
Radagast, the fourth, became enamoured of the many beasts and birds that dwelt in Middle-earth, and forsook Elves and Men, and spent his days among the wild creatures.
Dva zbývající Istari byli Alatar a Pallando, Blue Wizards. Nedokončené příběhy uvádí
Whether they remained in the East, pursuing there the purposes for which they were sent; or perished; or as some hold were ensnared by Sauron and became his servants, is not not known.
V Dopisu 211 Tolkien rozšiřuje o něco více:
I think they went as emissaries to distant regions, East and South, far out of Numenorean range: missionaries to enemy-occupied lands, as it were. What success they had I do not know; but I fear that they failed, as Saruman did, though doubtless in different ways; and I suspect they were founders or beginners of secret cults and 'magic' traditions that outlasted the fall of Sauron.
V Lidé Středního Země Tolkien později napsal, že mohou být úspěšnější, než se jinak myslelo, takže se jeho myšlenky na tyto dva roky mohly během let měnit:
The 'other two' came much earlier, at the same time probably as Glorfindel, when matters became very dangerous in the Second Age. Glorfindel was sent to aid Elrond and was (though not yet said) pre-eminent in the war in Eriador. But the other two Istari were sent for a different purpose. Morinehtar and Rómestámo. Darkness-slayer and East-helper. Their task was to circumvent Sauron: to bring help to the few tribes of Men that had rebelled from Melkor-worship, to stir up rebellion and after his first fall to search out his hiding (in which they failed) and to cause [? dissension and disarray] among the dark East. They must have had very great influence on the history of the Second Age and Third Age in weakening and disarraying the forces of East who would both in the Second Age and Third Age otherwise have outnumbered the West.
To je rozsah, o kterém víme o Blue Wizards.