One thing to remember about GMG is that as the other Kusarian factions, it also has a very japanese way of conducting business. By "japanese" I mean backstabbing. Samura won't be stopped through Sigma-13 by GMG forces. It's just their transport will accidentally get attacked by Dragons somewhere on the way, and - just as accidentally - their transmission regarding help against Dragons will never be heard by the GMG. But if they come up to the GMG's faces, everything is fine and dandy. Remember not to be open about GMG stance with Dragons. It's a carefully guarded secret, otherwise Kusari would come to deal with the Guild.
As to the question who will we fight: Outcasts, Corsairs, Hogosha, possibly even Farmers Alliance if they are helping their Hogosha friends. Despite the ridiculous NPC alignment (i've made countless arguments about it), we should try to ignore Bundschuh until they openly attack us.
Also naming convention: japanese names and surnames for security, names of islands/seaports in the Okhotsk sea for transports and explorers. Check the Islands of the Sea of Okhotsk box here. My trader character is GMG|GTS-Baydukov (GTS meaning Guild Transport Ship).