So today I was playing me some Skyrim, and I had me a thought.
And then I spent some time cruising through the available materiel, and that thought hardened into a theory.
From the BPRD internal communique regarding Marceline:
>Marceline Abadeer is the only daughter of the late Hunson Abadeer, aka Molag
>Bal, better known to modern paranormalists as the King of Vampires or Lord of
>Blood - the former Duke of Sheol who created the sanguivorus curse, as
>occultists will still insist upon calling it. With his destruction (sometime
>between 1865, his last recorded appearance in the mortal world, and
>2406), she took the title of Vampire Queen for herself.
And from the second part of Shepard's Eleven, Shepard's Privateers, we have this:
>SUNDAY, AUGUST 6, 2406
>NIRN, MUNDUS SYSTEM
>BETHESDA SECTOR, OUTER RIM TERRITORIES
>As they left the monastery, Shepard turned to her and asked,
>Jack shrugged. "It's what they call people who can do the Voice without being
>trained. Like I said, who'm I to argue?"
Again, emphasis mine.
Up until now, I had been operating under the assumption that it was Akio who did in ol'Hunson and usurped his throne.
However, until proven otherwise by text or word of god, I am now utterly and completely convinced that it was, in fact, Jack who murdered Molag Bal right in his big, stupid face. Probably by kicking a hole into Oblivion via sheer force of will and, hopefully, beating him to death with his very own Mace, because Jack is ironic like that.
Akio was merely in a position to capitalize on the power vacuum when it occurred.