You might want to check this webpage, it kind of discusses the final sources from HoME listed above in perspective of all other sources on the Blue Wizards.
http://www.lotrlibrary.com/agesofarda/bluewizards.asp
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"He was sent by a mere prudent plan of the angelic Valar or governors; but Authority had taken up this plan and enlarged it, at the moment of its failure."
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