Ok, so here is my understanding: The weapon was built on Altis as the research base was on the island, but CSAT had control over the island for a very long time with the AAF, and they probably didn't know about the device so CSAT could have easily moved it so why didnt they? A sentence from the final mission in the "Apex Protocol" says that "Tremors are its starting sequence" which means the earthquakes are just the device preparing to make the tsunami, so why was the device armed on altis. Altough miller continued with the one device on tanoa instead of taking another i have a theory for that, those other devices were being built and they only had enough resources to build one completely, and from what i think is that the scientists there when they knew the CSAT soldiers where coming they deleted the data to only allow CSAT one weapon. Another thing that interests me is Group 14 actually even apart of Britain or NATO forces? In the East Wind Campaign crossroads says "We have finally identified Captin Scott Miller" something Kerry says makes crossroads say "Listen corporal, you stay the hell away from those brits and their black ops bullshit!" Who is captain miller? Is he apart of a private army or a secret cell within the British special forces that barely anyone knows about that wants the device or something? because NATO doesnt trust him, the rest of the CTRG groups dont know whats going on, the only person who kinda did was the British officer in the Apex Protocol, but this still leaves some question unanswered, one is where the hell did Kerry and any survivors he picked up go if you choose the ending in which NATO loses? And the Apex Protocol showing crossroads doesnt mean that NATO won on altis, he could've escaped along with the AAF general and peace talks begun. i know it probably doesnt make a whole lot of sense but this is what my thoughts are