Where we let the eyebrows do the talking

I would totally agree with that. SHeppard is a screwed up individual and some of that probably comes from the rather lonely childhood that the writers keep hinting at. Lorne on the other hand, is one of those guys who agreed to do a job and did it, no matter what he had to do to get it done. He doesn't talk about it, doesn't brag about it, just does it. Alot has changed for the character since it was first incepted. But word! Lorne's dark is from experience, not because he is a dark person.