Subject: Ah, I remember that thread now!
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Posted on: 2018-12-11 04:00:00 UTC
Well, I'd say the Angels are closer to Black/Blue with their focus on secrecy and their stratified knowledge and revelations as a Marine progresses further through the ranks. (Some may never reach the final layers of secrets or know the real motives behind the Hunt. Leonidas, as a Company Master, has served in the Deathwing and is thus a full member of the Inner Circle, however.) And Black as primary reflects their willingness to sacrifice their honor and even their lives as penance for the actions of their predecessors, the Fallen. Supreme Grand Master Azrael reflects in Legacy of Caliban that should their worst fears be realized and the Dark Angels' secrets are exposed, they will not fire a single shot in self-defense against the Imperium.
At the same time, there's an argument, made by Master of Sanctity Sapphon, I think, that the Chapter must survive at all costs, on the grounds that many more innocents will die without the Dark Angels to defend them. Considering the clout of the Unforgiven Chapters as a whole, he's not just bragging. And I think the High Lords and the Inquisition appear to recognize this as well, which is why they accept the Dark Angels' zealotry and outstanding battle record as an excuse for their isolationist and questionable (at times) actions.