I think it may be something more complicated. Without a doubt the MC is more than what meets the eye. The dead mindflayer with the hobgoblin, the dreams, the ending lines of EA, etc hint at this. Shar is all about memory loss too. I get the feeling we will get shoehorned to being attached to shar. Maybe a new shadow creature created by shar or a new subterfuge avatar of shar with a tadpole. A new checkmate to destroy her enemies.
I hate it. I see the anime amnesia coming and I hate it even more. Datamine suggests but does not confirm they all worship shar but to different degrees. Even karlach and gale. Secrets is part of shars too. So I wouldn't be suprised.
I don't know anything for sure and honestly I hope Larian does not go in that direction. It could explain why you don't get an origin and start in the middle of the ship though.
All speculation.
