How would it effect the show and universe in general if an earth force ship had been destroyed by the shadows at the behest of Lando causing EA to help the Narns

Figured it'd be a cool detail to share with the class since I noticed only the deluxe edition has it

So I've watched all five seasons, the re-edited pilot (that comes with the DVDs), and In the Beginning. (Have to admit I found season 5 to be a bit of a slog, particularly with Byron and the telepaths. How is it that people who can read minds are so clueless about how other people think?) Do I watch the other movies? Do I watch Crusades? Do I read any of the books? If so, which and in what order?

Edit to fix my misnaming the telepath material.