Correct. House Djergurn has set themselves in the northwest corner of Farlsmark, alongside a major trade river. The Gavstorians use that trade route very often, yes, but there is also a second dwarf clan to the north, the Skureggas. They are not devil worshipers, and are generally recognized as good-hearted folk. As such, the half-elves under House Djergurn developed a very personal relationship with these two dwarf clans, and considering how it was only within the last 10-20 years that Gavstor was corrupted by Asmodeus, House Djergurn named itself in the dwarvish fashion during a nobler time, and were certainly much grieved by their downfall.
House Glangelot are renowned for their mines, and as such attract a lot of dwarf attention as well, but in a more distant / impersonal way. Their relationship with the dwarf clans was always more of a financial one, as opposed to a personal one, so when Gavstor went to the dark side they were cool with capitalizing on the new opportunities.
