For the Bennet part, you mark a point!
But for those who say the brain thing doesn't make sense, I think it does, IN THE STORY.
Sylar hits his victims by opening their brains and gaining their powers.. So the main power generator is the brain, Sylar needs it fresh and alive to get the power active, if it's dead, he can't. So that would be why Adam and Peter could only be stopped by deactivating their power source, the brain. My theory, think what you want. I thought of it in season 1, while trying to understand why Sylar proceeded like this to gain powers.