I'd like to update the sparrow article properly, so I'd like to know your source for putting Plocepasser in Passeridae. The one you gave in a hidden note is about the lice of Malagasy warblers, and does not discuss sparrows or weavers.
Topic on Talk:Sparrow (usability testing)
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The following place the genera in question in the Passeridae: IOC, IUCN, Zoonomen, and ITIS. I see Clements has it in Ploceidae. I went with consensus, since we don't have a single standard.....