Take Alice, Church, Sedna. They lived the past, but have been living planetside in the now. Pate is (aside from having not experienced the past directly, and his lack of "immortality" etc) more like them in being here on the planet. He's less than fond of those who keep things this way planetside, although he appears the only one (maybe Church, Alice seems noncomittal, Senda not seeming to care). Alice doesn't like The Praeses sure, just for other reasons than Pate. OTOH, the two from offplanet. They've been living more the way it used to be, only recently going planetside and interacting, out of their element. One of them is perhaps a mole, on a lark, the other more focused, up for conflict. Gavia is more like Alice, Ardent more like Senda. Then of course the alliance of Church and Pate, unlike the other four in attitude, but more akin to how Gavia and Alice think of a number of things. So, there are a number of ways to mix the groups, although clearly for now it's the four aligned against the two.
Perhaps the story is not so much about the human-seeming things from the past but more about these people of the present. Although it could be the differences between what we might could see as three groups of two. Maybe things will change as the story progresses, other alliances for other reasons. More groups to contend with. However it's counted for these six now, it seems like it's building up to some confrontation with one or more groups and others, perhaps a revealing of plans, maybe a bigger picture. Yet and still. Such as The Nightwalker's actions could have little to no larger meaning. It might be The Praeses have not directly orchestrated most any of this.