Many reasons:
1. Legal Claims of Central Occidens
Asylon was a signatory.
That seemed like the most logical reason. I wouldn't have considered Asylon a claim holder on that land, though.
2. Asylon's Expanse
When I started plotting Terran's northward expansion, Asylon held Farrowfield. We weren't sure of Asylon's capability to hold any of these lands, but that's how things stood. As Asylon could make a real claim to inheriting Caerwyn's claims, and as they pragmatically had a big influx of nobles and their borders practically encircled Terran, they seemed like the logical people to approach. It doesn't look that way now that they've lost a few regions and there's an Astrum flag on the map. But it sure looked that way two or three weeks ago.
If all you did was look at flags on a map, then sure, you could think that was the situation. But if you took a good look at the real situation "on the ground", so to speak, it was anything but that. We knew that Asylon would never hold all that land. Didn't ever have a prayer at holding it. And Asylon already knew that Astrum claimed all that land for the new colony.
