pretty much all solar systems are remnants of the original first generation stars though, yeah? if the universe started with nothing but hydrogen, that was the source of the first gen stars, then it took those dying off to give us He,O,C, etc.

The one that gets me is the theory that Earth is at least a second generation planet. So, maybe Ryugu returned some of the material that survived from what made up the first gen planet(s) Earth was formed. The fact that Jupiter hasn't hoovered all of that up is also impressive.