I know but isn't Riverrun extremely close to where the Frey's are? Or am I tripping? Walder Frey told Jamie last season that his "son in law" (Arya's uncle ) was back in the dungeons so I was wondering if Arya freed him off camera before or after she killed The Freys because if her uncle takes back over then that's one castle and Army at the Starks side
Are you forgetting Jaime used the Uncle to take Riverrun from the Blackfish and then they vacated the premises?
And Arya would have no clue if he was there or not.