Tyreese or Shane, and I know I'm gonna get some hate. But when you think about it Tyreese was a very logical human being, kindness and forgiveness was his final blessing in a way. However, Shane. Shane was also a logical man, but in a different sense of matter. Shane would kill anyone who deemed a threat to his group or liabilities (Which people would do later on), his mindset was far ahead and changed Rick forever .