[If blue and green are that unusual, that tells Shepard a lot about the garden worlds of Gideon's acquaintance— as does the fact that it's in ruins. A waste of resources, by any measure, if it were truly undeveloped. Still, she waits, and nods when prompted.]

So the Cavaliers are like the body-guards, so the necromancers can do the work without worrying about watching their backs all the time— especially if they think that getting to them before they actually get to be one of these Lyctors.

[Whether it was a competition for limited positions, or just people being ready to revolt against their political leadership, or even just garden-variety terrorism, it's not hard to imagine a circumstance in which a well-trained personal bodyguard might prove necessary.]

Go on, I'm following.