My theory is that Albus is a Morris. he certainly looks the part of a Texas Gunslinger. Maybe he Steals "Dominus" to give him the power to carry out the duty he's been charged with, and maybe Shanoa is the mother of Quincey, depending on OOE's place in the timeline.
(like someone else has said, I highly doubt the Novel is the actual representation of 1897 in Castlevania I have no doubt that Harker, Mina and Van Helsing would still be involved somehow, but this is to be one of Drac's normal ressurections, where he's at greater power.)
OR, Albus could also be a Lecarde, and the Dominus may be what allows the Lecardes to Summon the Power of the Vampire Killer.