Xin Ceithan, once you have filled your two placeholders I can try and edit my attack on the Habitorius so that it fits together better.
Oh. It is mostly just the warband moving in, clearing air defenses for the Host and spreading mayhem to thin the veil enough to allow the helldrake to attack / exist there. They are also on the ground to get a fix on one-off the Ordos fortresses/ safehouse in the area for the McMuffin that drew them in in the first place. Then they get mixed up with some Sororitas defending it and just manage to fall back with the air support of the helldrakes... The idea is they get banged up enough that they are really in a tight spot when the loyalist Marines drop.