I think it was a good choice too. But you can tell that they are really one book when together, because the themes of the two work so well together. When it really gets down to it, Feast and Dance are about maintaining power and peace once you've attained it, and Jon, Dany, and Cersei all go through their own variation of this arc. Plus, I know some people don't really like books 4 and 5, but together they enhance the other.