So in halo 4 the librarian claims that before the halos fired she indexed man kind and placed some special genes in them, so that mean that everyone has forerunner genes or just certain people because she also said to chief “YOU are the culmination of a thousand lifetimes” was she referring to chief only or humanity as a whole? Also if she indexed all life in the galaxy, why isn’t there more forerunners?
“Your physical evolution, your combat skin, even your ancilla Cortana.”
She was referring to all of Humanity, especially the Spartan Program. As for why she didn’t reseed Forerunners, its because there time was supposed to be over, and humanity is supposed to reclaim the Mantle. Also, some Forerunners may have survived the array.