For one thing, it is not clear to me what you mean by fitting an author in a genre. Could you explain that example using other words? Or give us another specific example, with more explanation, please. The more specific information we have, the more likely we are to be able to think of a useful word.
I would like to say where in a genre a specific author could be placed according to his works, e.g. in the vast field of detective fiction, to which corner of the genre, let's say, Bret Easton Ellis belongs to, or where exactly "he fits in" (to use the phrase for which I wanted a synonym). E.g. [+detective] [+hardboiled] [-locked room mystery]
As a matter of fact sometimes it is not easy to say where within the field of a genre an author fits in, because it's the authors who create the genres. Therefore, the identification of the genre a work belongs to might easily be mis-identified (to use your words)
...anyway, sorry if I'm complicating things. Thanks for your answer