I was a candle

There aren’t really many connections between the Devils and the Judgements. They’re definitely caught up in the Chain, to some extent, but probably not near the top. The Devils never rebelled against the Judgements, but the Judgements are still out to get them, for some reason? I dunno. The first devil-hives were built on the edges of Parabola, in the marches, so they are at least involved with Is-Not to some extent, I suppose. 

It seems like devils still exist out there in the High Wilderness, though, given that the Merchant Venturer has you pack zzoup for his trip North; “specialist tastes”, he says. The Brimstone Buzzings you can collect at Palmerston, vague though they are, mention “Judgements” and “Alliance” in the same breath, so there’s also that. The Iron Republic is the closest thing to chaos they’ve really done, given that they replaced their monarchy with a bureaucracy instead of anarchy; even then, there’s one devil there who’s like “man was this even worth it?”.  Judgements and devils do both make use of souls, but heck even knows what the devils are actually doing with them. Make of all that what you will, I guess, I don’t have much of a coherent theory to present this time round.