Silmarillion - Chapter 10 - Of the Sindar

[William Cloud Hicklin]

Christopher Tolkien’s merging of the two traditions in the published Silmarillion does have some precedent in his father’s writings

An even more dramatic precedent is found in the Akallabeth, which JRRT constructed by interleaving passages from the latest versions of The Fall of Numenor and The Drowning of Anadune, togethger with new writing. Underlined on the page, it looks startlingly like a similar breakdown of Christopher's work on most of The Silmarillion.