Very interesting theory, postalgirl. I love how you think out of the box, or should we say "out of the valley," in this case. LOL. That would really be a twist if if was Adam himself. So, you're thinking that because he was out of his right mind thanks to the devious Dr. Dave's pharmaceutical concoction, he was really attempting to commit suicide, but instead shot his twin by mistake?
My theory is that Adam shot Stuart. Keep in mind, he was drugged at the time and he, himself, wanted to die. Why not shoot Stuart thinking that he's shooting himself? I always think outside the box. I like that theory better than a new comer. I hate it when it's someone that we don't even know. I like it when it's twisted, yet good. Adam would get away with it because of being drugged and not being himself. I always justify.