Halo 5 has a game mode called Strongholds:
https://youtu.be/lbM5B7yesuI
Using Halo's definition of what a stronghold is would lead you to believe that there is a location to be "captured"
If the blueprint really is representative of the game field then maybe the large central structure will fly the flag of the team that has "captured" it by dumping/shooting game pieces into it or something.