No. You have me confused with the "protestors" outside the Laundrie home. That's not my MO.
You pose interesting hypotheses but lots of people manage to make it through educational curriculums with no emotional maturity. I don't know if I think he was intellectually gifted but nor do I think he was intellectually stupid so I'm sticking with man-child, arrested development. I think they bonded over their granola-eating, yoga-doing, litter-hating environmentalist personas and she thought she had found in Brian a kindred spirit and ultimately discovered he was only masquerading as a human being.
O.k. I get it. You will never change your mind about Brian, understood. I'm not emotionally involved in the story, so I'm just chatting.
I will put this idea with you, since I think it's possible. Let's just say, hypothetically that Brian was a little immature with some minor mental disorders, but otherwise about average in most other ways. He really loves Gabby and has some crazy emotions for her, but she keeps hitting him, and nagging non-stop for one to many days?!?! (More theories) Brian's emotion finally gets the best of him, and screams, SHUT THE Fork* UP, grabs her by the throat, and keeps yelling stop acting CRAZY YOU STUPID F----- B-----! By the time he comes back to his senses, Gabby isn't breathing, and he panics. The rest is history.
Let's say, this is what happens for discussion purposes, does this change anything?