User blog comment:Miskos3/Fairy Tail 514: Dragon Seed, Review/@comment-24102956-20161214082849/@comment-9595671-20161215050035

Actually, I think that's just a representation of the Western and Eastern Dragons in myths, cultures and traditions, which actually fits how they're seen in each.

Western Dragons are usually considered to have a more villainous depictions, while Eastern dragons are more like snake-like and much kinder to Humans. This fits how the Dragons were defined by where they lived in this chapter.

Even Belserion's comment about the Western Dragons not being as intelligent actually relates to this, as Western Dragons began appearing as more intelligent in many works after Tolkien's portrayal of them.