Some other stuff is going on, too, as the whole “threat of the Great Darkness” thing begins to take a back seat to the more pressing issue of Sakhmet killing a whole bunch of people awhile ago. That, combined with her mixing it up with Persephone, is beginning to present a lot of issues for these gods, none of which seem to have much of a solution at the moment.
This story has a lot of characters, and as time has gone on, they've begun to splinter more and more into smaller and smaller groups. As they've developed, the events of their two years on Earth have begun to get more and more complex. At this point, things are leaning ever closer to the end of their time with us. The days of Baal being a rockstar and Lucifer hanging out in her Bowie-esque glory are over, and now we have a much bigger problem on our hands.
Keiron Gillen and Jamie McKelvie are on a runaway train that seems to show no signs of stopping. There's no problem with that, but it's a wonder to think that we've gotten here from where we began in this story.
This book has been incredible from beginning to end, and while the second part of "Imperial Phase" is just getting things underway, it'll be interesting to see where it goes from here, and when things are really going to ramp up.