I'm kind of confused tbh on why this raid exists. The wyrmrest accord clearly is at a tentative peace with the black dragons as shown by their ambassador at the top, who even though makes critical comments against the others, is maintaining said peace. So it seems rather odd then that the flights would let us skip on into the chamber of the aspects and then slaughter the guardian of one of the sanctums where the clutch of eggs lie. Indeed the guards in the chamber of aspects just watch us run right in there. Also blizzard seems to hint that we'll be killing a guardian of each flight. It seems rather odd that the flights would let us do this right under their noses. Especially since this is where their clutches of eggs lie, you know the whole future of their kind.
Seems rather out of place tbh. It's like "we will help you mortals in this fight against the blues, but in the mean time feel free to go slaughter our minions and children down below, they drop some shiny gloves." You think blizz just didn't have anymore ideas for a raid? Hopefully they will release some explanation for this, but so far the obsidian sanctum has no lore released and is the most least explained loot pinata of a raid in the game at the moment.