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Lets not forget that even before the Heresy there were frequent times the various legions worked together on the same planet/system. Alpha Legion "manipulating" some Berserkers, Noise Marines, and a Thousand Sons Sorcerer who thinks he's manipulating them while they're manipulating him while he's manipulating them wouldn't be new territory for anyone, and mirror's the same multi-chapter crusade action we see from the Loyalists who co-op while still having their own Agenda. Like Ravenwing splitting from White Scars to go check out a dust storm hiding some Fallen that are sort of but not really working with Abadon they REALLY came to investigate.