Your alignment is on a sliding scale. If you were Dark Sided all the way to the Oasis, it's not going to be a quick slide to the light. You can eventually get to the light, but it's not gonna be a "well, I saved that orphanage, I've redeemed myself of the seven orphanages I burned". Esspecially because it's 1000+ points to get each alignment rank.
I'm well aware of the scale, I track those points. That's not what I'm asking. Does that determine the dialogue options that I'm given? I'm actually positive on alignment points, was so before the scene on Jaesa's ship.