Ok, I'll bite. You've been working this in to every post you make, so I can't not comment on it at this point. Dumbledore didn't put his mark on anyone. In the beginning, it could have been either Neville or Harry. It was the fact that Voldemort believed he prophecy and chose to attack Harry that makes Harry the "chosen one." If Voldemort had attacked Neville, it would be him (if anyone) and if he hadn't attacked either one, it would not have been either. It was Voldemort's belief in the prophecy and his decision to act on this belief that caused the whole chain of events of the story.