Minfillia also explains to not actually being able to 100% understand what the Echo is or how exactly people end up with it. They could be born with it, or they could simply get it from the seeing the starshower. Since even the one who claims to know the most about it in-game isn't 100% sure on it, I'm not sure we can use her words 100% either. I mean....a good couple of centuries ago we thought the planet Earth was flat until it was proven that it was in fact round. This may be one of those things that we'll never truly know unless a Dev, or even Hydalaen tells us specifically.