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My dad has a theory for Cercei’s death and it’s freaking good!

So I was watching the last episode of the season 7 of GoT with my family (we are all super fan). And the next morning my dad told me he had a theory for Cercei’s death. He just told me: “So Jaime left for the North to join the others in the Great War. But what if he died in this war and Arya takes his face and goes to King’s Landing and kills Cercei. And remember what the witch told Cercei when she was a girl? She will be killed by her little brother and she was born first.”

This is so plausible!! What do you think of it?