Late plotting is late.

I've only hashed out that Oberyn will be traveling/protecting Margaery and Caius at some point.

Otherwise he's free and OTA. Warning, Oberyn is a very skilled fighter and one of the warriors at the Coliseum; however, upon finding out that he's suppose to fight with his fellow friends here, he's not going to be into the battle. He wants to go home, but not at the cost of harming his friends.