re: Crackpot ASOIAF Theories SPOILERS

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Oberyn and the Dornish aren't exactly essential to the events of the Purple Wedding. It just felt with the pacing that they were completely building up to the Purple Wedding.

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They aren't essential to the PW persay, but it would have really screwed up the narrative to not have them there. They would have had to work twice as hard to make the story fit later without them there, and it wouldn't be smooth.