So I just saw the most recent Rebels, with Zeb and Kallus. In t they find a warm, glowing rock conviently near where they crash on an ice moon. Agent Kallus ends up with this rock, in his quarters, as he begins to question his loyalty to the Empire. (or so it seems to imply)

That rock, to me, seems like a dead ringer for a Barab Ingot, a potential lightsaber crystal. If so, what might that mean? For Kallus, and for any of the jedi or darksiders who might recognize it?