Vader is nothing if not an advocate for justice dealt in equal measure, and he has been so very wronged. Galen Erso will learn to regret aligning his maps to the wrong meridian. (Vader corrects Krennic's mistake. Jyn is both collateral and a painful replacement.)

"You don't get to wander back from dark places without the light stinging your eyes a bit. It reminds you where you come from, and that you can go back to it if you want." (A child of Pennsylvania miners, Georgia sees in Dr. Lecter a man that is seeking his lode. From the hospital room down the hall, Will digs for him without thought of how to get back.)

Purpose, whispers her heart, shuddering at the magnitude of it. Amren, escape, and the gathering of treasures.