I'm not sure if this is actually significant, but I can kinda see a resemblance, or a parallel between the human factions and the enemy factions in destiny. The Cabal and FWC both share a mechanical aesthetic of sorts and a war fetish, Dead Orbit and the Hive both seem obsessed with death and kinda emo-y New Monarchy and the Fallen seem to both claim regal authority and splendor, despite one of them living in a rather liberal futuristic city and the other being poor as shit. We know very little about Osiris and the Vex, only that they both hold great importance gameplay wise (Osiris seems to be in charge of high level crucible stuff, and the Vex seem to own the vault of glass). We know even less about 7 seraphs and the darkness. So yeah, what'da think?