[Overread]

I think the ending for fools was done longer delibraty. It was meant to be the final book in the whole realm - at least for a considerble time to come. Thus I think Robin made an effort to end the book and series fully. Also, do you remember the tiny error between the last assassin book and the liveship traders? In the assassin books, fitz details the he sailed down the rainwald river - yet made no mention of the acid or the rainwalders - thus a longer ending makes for a more complete picture.
Further, as the Fool and Fitz parted company and the books are written from Fitz's point of view, it would be hard to document the full ending for the Fool.