Midgardsormr Clarification? (Spoilers)

[Anonymoose]

Don't forget the entire reason why you joined the scions in the first place; you have the echo.

This is a much more reliable assumption when talking of those were grandfathered in from the Path of the Twelve. The Scions accept all sorts, though they went out of their way to recruit Hydaelyn's champion due to their possession of the echo among other admirable traits. If I remember correctly, Hoary Boulder says when he's introduced that he's a largely unproven adventurer who joined because he was inspired by the tales of the Hero of Eorzea and wanted to do his part.