Nothin to specific.
I kind of pictured him as a former Craftworlder who has taken a liking to the dark pleasures offered by Commorragh.
But not too sure if that would allow for regeneration by a haemon.
I've always imagined my Kabal being based in the Docking Spurs, as an explanation for my many and varied allies.
On a side note, in a way it makes more sense for young kabablites to be corsairs, as the soul thirst wouldn't be as great, alooeing them to stay in real space longer. An ancient Dark Eldar would need to be murdering left and right to keep a youthful sheen in realspace for any length of time. I think.
"Whereas the duty of the Imperial Commander is either to seize or defend territory, the Dark Eldar make war only to steal. If, as a by-product of this, the are able to indulge their vile passion for murder, torture and other decadent acts, then they will joyfully do so, but this is not their primary goal"