How do you deal with attribution of a work that is derived from a work that is itself derived from an original work protected under CC BY-SA?
And while we're at it, let's push it further: Let's call the original work "Work0" and its author "Author0", the first derivative "Work1" and its author "Author1", and so on.
As AuthorN, to whom should I give attribution? All the previous authors? Only the one before me, AuthorN-1? Or only the original Author0?