There is another reason this season is slow.
Book three... most of the end of season four, was the conclusion to those first three books.
GRRM planned to start the next segment five years into the future because every character's story was at a good jumping point. He scrapped that two years into writing it and just continued on from where book three ended. Even the best writer would have to start doing a lot of boring rebuilding.
The problem is, most of what he ends up building is directionless and doesn't progress the story, all while adding more and more aimless characters.
look here, upon a sig graveyard.
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