I know he is, however, when you begin as TDU, you get some choices. Maybe those choices are setting you up, to continue having choices, or to simply give in and have less and less of a choice. Since you lost your memory, it doesn't matter what you did 15 years ago, you are going to face that at some point though.
the dark urge might be very dark, despite you choose the redemption.
i do think the dark urge is the avatar of bhaal, not the avatar of the player character.
this is impossible that the dark urge denies his nature and still can exist.
since the dark urge accepts his/her dark urge and be corrupted completely 15years ago.
the redemption might seal him/herself.
or the dark urge choose return to the dust, return his/her dark urge to bhaal.