I fix ISBN, authors and author_sort (and title) when I add the book to calibre, the first time. Typically first ISBN, using the find ISBN-plugin, then download metadata. Then adjust title, authors and series information. After that neither change ever, unless I made a spelling error. Information from author can be used to update author_sort, but the other way I don't think is as easy. So whatever is as authors is isolated from what I write in author_sort. That is why it works so nice to have "Edited by" in the author_sort field. Makes it easy to see what books are anthologies.
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