Yes this book have two authors. But for me it should copy the author_sort values (Cussler, Clive and Scott, Justin) as text string into the two "aut" roles like
<dc:creator opf:role="aut" opf:file-as="Cussler, Clive & Scott, Justin">
Cussler, Clive</dc:creator>
<dc:creator opf:role="aut">
Scott, Justin</dc:creator>
More or less in the same behavior like I use it as template for generating file names
like "Cussler, Clive & Scott, Justin - Isaac Bell 08 - Der Attentäter (Thriller, deu, 2017).epub"
But to be honest, I do not remember if this behavior had change some when in the past as I use it mainly for filename creation and there it works like I expect it to work.
I recognize also today that there exist this [opf:file-as="Cussler, Clive & Scott, Justin"] if I made a export. Is this intent as a kind of reference information?
Nerveless, it is maybe a good point to ask @chaley if he can find someday a bit spare time to look at.
