After watching the legendary ending of halo 4 and seeing the top half of Chiefs face, I have drawn up the hypothesis that Chief might well of become a forerunner.
Although this is just a my theory, could the librarian have altered his DNA to that of a forerunner?
Evidence to support this hypothesis;
1) when the librarian returns Chief, Cortana says his bio reading are of the charts.
2) when comparing Chiefs face viewed in the legendary ending to the librarians you see he has a similar nose structure.
3) following the 2nd point if you see the normal human nose it has a distinct bridge, Chief doesn't appear to have one.
If anyone has any points they would like to add please feel free and I will listen.
