Baron Spikey: I'm sorry. It seems so rare when you're not spot on the money, I had to mark it as a rare calendar event.
As to the Darth Vaderisms of the SoBs, I agree. Except I doubt that Emperor Palpatine ever had Darth Vader supplicating hymns of unending bliss on his knees to the Emperor... (read into it, I dare you).
The Brides of the Emperor were more like Vandire's Harem, along with being his most elite, ruthless and cunning bodyguards... well, except for Sister Ruth. She wasn't Ruth-less...
And I think the reason the Sisters focus so much on atonement now is that simply killing Vandire did not absolve them. They were allowed to carry on under the Degree Passive as the lone body of military might available to the Ecclesiarchy, and even then, they're not exclusively responsible to the church. They also have to answer any summons by the Ordo Hereticus, or even the Ordo Malleus. On top of that, they have both the Arco Flagellants (not necessarily women, so much as captured heretics turned penitent) and the Sisters Repentia to show how much the Adeptus Sororitas and the Ordo Hereticus have not forgiven the Brides of the Emperor...
But that they are human, and therefore not perfect, the organization is allowed to continue, with some changes, and serve the Emperor (which was what they'd been intent on from the off).
EDIT: 1) I realize I just stole your reply on being human... 2) Ordo Malleus would be able to summon them through the allies rule. Where, your main force is DH, but you don't field GK, and instead field SoB (not much difference in DH and WH aside from the specialist units, but it's still a distinction, if you want a fluff reason to say the Inquisitor has a daemonhammer).