Katharine Kerr hosts a Deverry Q&A discussion

Even though HarperCollins UK split the series differently, to me the last four books form a quartet. That's GOLD FALCON, SPIRIT STONE, SHADOW ISLE, and SILVER MAGE. Obviously they also hark back to the rest of the books, and Morwen's story links up to Jill's reaction to Loddlaen and Alastyr both. Any thoughts here about these books as a quartet and as the completion of the saga, too?