In Hero of Ages, TenSoon states that Sazed is the
Announcer who recognizes the Hero of Ages from the prophecies.
At the end of the book, however, it is revealed that
Sazed himself is the Hero of Ages, and takes the power of both Ruin and Preservation to remake the world.
Sazed does recognize that he himself would become the Hero of Ages, so he has both titles.
Considering that both parts of the prophecy are quite distinct and apparently important, how could these two facts resolve this? Was it simply an author oversight?