posted both your question and mine on the Q&A thread ... perhaps that will provide an answer later in the week
from how i understand it, the players are only ever battling in the outposts or stronghold, not both at once. and they only battle in the stronghold after the defenders successfully capture 2 of the 3 outposts within the given time
then try this on for size lol... say territory #24 has 3 outposts .... one has been captured by LSM, another by CSM and the 3rd by Orks each needs to capture one more to unlock the stronghold battle instance how does the matching system create the scenario? can each faction challenge the other 2 factions for their outpost at the same time? ( LSM attacks CSM, CSM attacks Ork, Ork attacks LSM) or (LSM attacks CSM and Ork, CSM attacks Ork and LSM, Ork attacks LSM and CSM) or can only one be attacked at the same time and if so who gets the chance to capture their second outpost? if each can attack but more then one outpost changes hands how does that work? since that might only mean that after a round of outpost captures each has again a single outpost, but if everyone can attack both other outposts, then more then one faction might end up with 2 outposts captured
Add to that the Nids, do they follow the same rules? Would they be able to skip the outposts and attack the strong hold automatically or do they need to take outposts too, and if Nids are attacking an empty instance, can other factions swoop in for the ninja cap?
youll notice almost all the "territories" have multiple borders so in theory could be contested by everyone depending on how the factions moved across the map
Unfortunately we will not be fighting Tyranids in the Continent Instances. Instead we will now only be fighting them in small PvE Overflow Instances. "PVE missions and Tyranid invasion zones are not considered as points of interest, they are separate maps which can be instanced as needed. "