The current Lord of the Vale, of course is the conveniently sickly Robert Arryn, who readers suspect is slowly being poisoned by Littlefinger.
The arch-manipulator plans to create a new power base by joining The Vale and The North under Sansa, with him pulling the strings.
As to the Ashford Tourney theory, it is based on events in The Hedge Knight, the first tale of Dunk and Egg. In it, five knights vie to be the champion of Lord Ashford’s 13-year-old daughter.
The knights are Lyonel Baratheon, Leo Tyrell, Tybolt Lannister, Humphrey Hardyng and Valarr Targaryen.
Each one is from a family that will be associated with Sansa.