I know the sudden appearance of Eleanor's young man has already been discussed and accounted for, but I have to say that finding out about him at the end of NA made me see that JA really did act as a bit of a fairy godmother, dropping attractive, eligible, wealthy and now titled men (a rare species anywhere) into her heroines' lives. In NA, the young man inherits money and title just at a comfortable time to marry Eleanor, instead of being forced to wait another twenty years!

Also, I notice that wherever possible, JA made her heroes orphans, and so did not burden her heroines with parents-in-law!