Jon is Legitimized by King Robb, but never learned of it. What if he had? Here, Jon gets the letter from his brother naming him Jon Stark and his Heir. But not until Robb has already died. Long Live the King
Eddard Stark loves his children. And that love for his sons changes everything. Rather then sending Jon to the Wall, Ned instead grants him a holdfast of his own before heading to King's Landing. Robb Stark will not be a lone wolf fighting his wars this time.