No, Obisidian should be put on Fallout - Obsidian is, more or less, former Black Isle, guys who created Fallout and who, unlike Bethesda, understand what Fallout is about.
Arkane might be a good fit - though I do find best game they ever made was their debut with Arx Fatalis (that's just my personal taste gravitating toward RPGs), they proven time and time again they know their stuff.