A – Imperial Border (1109)
B – a three-system cluster
C – the 11-system constellation Miigaurshish (pronounced ‘me – e – ga – ur – shish’) – the Wedding Cup.
D – the ten-system Daltharmai Main running to Spinward into Daltharmai Subsector.
E – a four-system cluster.
F – a five-system Run.
G – a seven-system Main running Rimward into Gamelea Subsector.
H – a three-system Run in Daltharmai Subsector.
Given that the Imperium was restricted to Jump-3 capable starships in the 540’s, Gazolan Subsector would have been entered from Kaorin Subsector through either the three-system cluster at (B) on the Gazolan/Daltharmai border, or through the Coreward “rim” of Miigaurshish (C) – the Wedding Cup – on the Gazolan/Thurgandarn border, or through the “stem” or “base” of Miigaurshish in Thurgandarn Subsector. It is likely that within these two astrographical features “great mineral resources were discovered in the Gazolan subsector and these fuelled the rapid expansion of the Duchy. This expansion was not unopposed.”
Looking at the map, I suspect that Kolin’s scouts did not actual come across any major opposition until they crossed over to the Daltharmai Main. A pocket empire based on the Daltharmai Main, with Jump-2 technology, could access the five-system run (F) to Rimward, and the three-system Run (H) and the Main (G) to Spinward and Rimward of (F). They could have also secured the Rimward rim of Miigaurshish and it is likely it was here that the Imperium encountered their second major polity in the RimWorlds.