Just a thought, but could 1 or both of the Blue Wizards have been corrupted by power(possibly becoming the leader of the Easterlings, I'm not up on their leaders)
If they saw a wise mysterious man from the west who had answers to many questions and mysterious power, they may come to serve or even worship him.
East-helper may even denote that one was seduced by Sauron, much as he was by Melkor.
And maybe, just maybe the Easterlings just slew the blue wizards on sight, and the all knowing "people upstairs" decided not to send them back.
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