I think it would be nice to see something about how the situation in the Gateway sector is influenced by the Solomani Rim War.
I imagine that, when that war begins, the Imperium gradually withdraws more and more of its military assets, particularly Navy units, from the Gateway Domain - from others to, but probably mostly from this one which does not face any major power across the border.
This lack of Imperial firepower, and the decreasing likelyhood (and possibility) of large-scale Imperial interventions, could fan the flames of ambition within the various client states and independent systems. Maybe the Sydites want to rebuild the Sydymic Outworlds Cluster? Maybe the K´Kree want to "convert" a Imperial client state or two to vegatarianism? Maybe a latter-day Alexander the Great tries to create an interstellar empire from scratch?