Here we go again with the theory that Harry is a horcrux. Well, I'm not saying Harry is a horcrux, but he could have been one. When Voldemort first gave Harry the scar was when his mother died. It was said that horcruxes are made when a murder was committed. As you can see, the horcrux was put upon Harry. Now we're thinking Harry must be killed in order for Voldemort to be destroyed. What if Harry wasn't a horcrux anymore? Throughout the first three books, there were no signs of Voldemort trying to kill Harry, only because Harry was his horcrux. Until the fourth book, Goblet of Fire, Voldemort attacked Harry. Why is that? Maybe at that same moment, the horcrux in Harry vanished. Remember how Voldemort came back as a full form? Hand of his servant, bone of his father, FLESH OF THE ENEMY. It fits in place when the drops of Harry's blood was added and Voldemort return as his full form. The blood was part of Voldemort and as soon as it was added, Voldemort came back as who he was. Ripping your soul apart was to turn you ghost-like, this was said in the book. What Voldemort was is ghost-like and after flesh of the enemy was added, the human body-like was returned to Voldemort. After the return of his full form, there was no need for Harry to be alive. In this case, Voldemort attacked Harry, but he failed to kill him. This is when the whole plot of killing Harry started: when the horcrux in Harry dissapeared.
Why would Harry be a horcrux? It is a confusion to the readers. For the believers that believed Harry is a horcrux... it will be a twist to them. During the chapters that they will read, the discovery that of Harry had been a horcrux will be revealed. Now it's a real situation, where either Harry dies or Voldemort dies. But of course the evil guy dies right?