I read this aloud to my 14y/o. At about the halfway point, they told me that while they still loved this, they didn't feel like it was quite as perfect as A Psalm for the Wild-Built, and I agreed. 

I think part of it was the addition of so many other people to the equation. All I really needed or wanted was more Mosscap and Sibling Dex on their own. 

That being said, the ending was gorgeous and perfect and exactly what I wanted.