User blog comment:BlueLantern1995/The Prophecies: What We Know and What is Logical/@comment-4640327-20121021213001/@comment-5273810-20121022014325

Well in that section with Frank and Mars it said Percy would have to accept a sacrifice. If Percy was able to do it in someone's stead then he would but since that is not the case he cannot be the one. I suppose that it is possible that he dies but I don't see him as the one dying in the prophecy.