There's also a matter of how many people want to actually read something like that, and how it's done. For example, Chewbacca's death in the EU books really angers and throws off a lot of people, not only from that book but also the books following *raises hand*
However, an official explanation might exist somewhere or be written, but from my overall, removed study of what Star Wars novels and comics seem to be around, I don't think this yet exists, as Jadesfire says.
But don't go on my word, I've read very little and my interest is focused on the Original Trilogy and New Republic eras (which incidentally means most of it is from the 70s-mid 90s). *shrugs*