Question on Query Letter Authorship

[Clippership14]

Here's an interesting question which recently came up in my local circle of writers:

Who should write the query? Should the author, showing an example of their voice right from the start--or what if they know someone else who can write the query better than they can, should they give the assignment to someone not as emotionally attached to the book? Is there a rule of thumb on this one? When you think about it, having someone else write the query does open up possibilities. The "ghost query writer" is not as worried about setting down every detail of the book. They can even give a more objective point of view as to what gets their attention about the book. They may be able to easily summarize the book in only two or three sentences. On the other side of things, the "ghost query writer" isn't worried about selling the book as much as the actual writer. They care, but there isn't anything at stake for them. What do you think about the idea? I'd love some feedback on this one!