All interesting points and observations. I see Shane in an entirely different light. First *GRAPHIC NOVEL SPOILER ALERT* the character known as shane doesnt live past the first comic/epsiode. he's shot and killed by carl...)
I see Shane as really being the most potentially volatile character. I could foresee him hooking up someday with the handless Merle character from season 1 (wherever he is). Shane has already shone his hand that he has no moral code. Shane is the anti-Rick. Shane desires desperately to not just be LIKE Rick, but to BE Rick. Rick is everything that Shane is not. Yet, Shane tries to give the outward appearance that he is like him. The whole affair with Laurie...the love for Carl. Shane NEEDS to be like Rick, and even tries to convince himself that he is, but he knows deep down that he isn't and never will be, and it kills him inside. I think we'll begin to see more and more of his dark side coming through the cracks as time goes on.
Remember when he drew down on Rick in his gun sights? A crack in the facade. When he attacked Laurie at the CDC? A crack in the facade. The WAY he killed Otis? A MAJOR crack in the facade. What's interesting about Shanes character is while the others are struggling 100% to survive this new world dynamic, Shane spends most of his energy struggling with his own inner demons, and his wanton jealousy of the man he wants so desperately to be. Further evidence of the strain this struggle causes him is his desire to leave the group behind.
The way he killed Otis speaks volumes. In this new world, EVERYONES reality is---you get bit even a little bit by a walker, you're through bookin'. Shane broke the only thread left holding him to humanity, because he made someone die the most ghoulsih and cruel way to die in this new world. If we had to list the causes of death in their world-- car accidents, cancer and heart disease are ALL behind being killed by zombies, and Shane forced a fellow human being to die that way. Even Rick couldn't live with the possibility that he forced Merle into such a potentially horrific demise that he risked his life and the lives of others to go back and try and save him. Shanes actions showed just how much off the"spool" his thread has unwound.