That makes sense, I've read the book but I honestly hadn't payed attention to who was playing what exact character.
I like Emma D'Arcy, and she def could look a lot like an older Milly if they were made-up the same.
Is the show actually good then? I want it to be. I love the books but I'm very much in the niche camp of "GoT stopped being great at the end of S3, and stopped being good at the end of S4". I think most showfags think 5 was the tipping point, and the pleb meme is "the last season was shit" - makes it very hard to gauge what the actual critical opinion is.