Perhaps the historians assumed that all those who came with the Istari to Middle-earth from Aman were the "wizards." If you count in Glorfindel, you have more than five wizards, the chief of which, are still the "original" five Istari. In that sense, the seemingly skewed perspective of the historians could make sense.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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