As you can see, San d'Oria lost control of Jugner Forest, of all areas! Way to hold it down! At the moment though Sandy is still up on the beastmen in La Vaule, but their advantage will probably be erased by the end of the day.
How's this for idiotic: some user on FFXIclopedia observed that the existence of Cuchulain's Mantles on Asura, without any nation having control of all its contiguous areas, "disproves" the idea that control of all areas is required for access to "Splitting Heirs" and the like. Have you ever heard of server transfers? I see that the concept of arbitrage is way beyond your ken.
Moving on, I've heard that Windurst has control of all its adjacent areas on Phoenix server, so its "beastman assassination" analogue to "Splitting Heirs" should be available. The Campaign op is called "Plucking Wings," and I'm sure we can find some information about it in a little bit. Check wiki.ffo.jp periodically. Phoenix server already has an auction house listing for Karasutengu Kogake (INT +3, Campaign: refresh effect) and Roundel Earring.
Edit (Monday): Cuchulain's Belt is also a potential reward.
To summarize, here are the treasure pools for "Splitting Heirs" and "Plucking Wings," and an inferred one for Bastok's "Cracking Shells":
Splitting Heirs (La Vaule):
0-1 of Cuchulain's Mantle, Orcish Gauntlets, Witch Sash
1 of Brave Grip, Wise Strap
2 of "miscellaneous" items (gems, Spectacles, Vile Elixir +1, etc)
Plucking Wings (Castle Oztroja):
0-1 of Cuchulain's Belt, Karasutengu Kogake, Roundel Earring
1 of Brave Grip, Wise Strap
2 of "miscellaneous" items (gems, etc)
Cracking Shells (Beadeaux):
0-1 of Airy Buckler, Balestarius, Crapaud Earring
1 of Brave Grip, Wise Strap
2 of "miscellaneous" items
Looking at the dwindling number of items unaccounted for from the June version update, it's a reasonable guess that Crapaud Earring and Airy Buckler come from Bastok's "Cracking Shells." Both those items don't have an "ex" flag. But both of them have limited appeal. The shield can be used only by THF/PUP/DNC. Well, the Crapaud Earring is of interest to the vast majority of black mages who don't have Novio Earring. It'll help push my Thunder IV to 1470 without food on Ebony Puddings if I maximize INT in all my slots. If I had Novio, that number would be 1512 before food. (I currently give up 8 INT out of cheapness and desire for a "maximum MP" setup for NW Apollyon.)
The fact that Castle Oztroja can be overtaken gives me hope that Beadeaux can be taken over as well even though the logistics are daunting. I just don't expect any group on Fenrir to be willing and capable of doing so.