Who knows, maybe Sarumen killed the blue wizards and there spirits went back to the west.
Maybe Alatar and Pallando did do great good for there cause and ended up going back, but it just wasn't mentioned in LOTR or "The Silm."?
They could have just as likely been corrupted by Sauron.
It would have made a great book to hear about the happenings of the blue istari.
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