It's not something that the writers on exemplarity are big on - or, rather, when they are, they talk about it using slightly different terms, more about the particular 'message' that a writer is trying to send with a given exemplum instead of how making the emphasis of an exemplum X changes how we have read all previous occasions of that exemplum (for instance). It is an approach that might work quite well, but I have to say I would need to a) re-read Hinds and b) have a case study in front of me to play with. I do want to follow up the Homeric porn angle at some point, though.

I don't think Hostius Quadra turns up elsewhere; I've not spent a lot of time with him, or for that matter the Naturales Quaestiones, although he does make an obligatory appearance in a footnote to chapter 3, so my knowledge of him isn't encyclopedic.