i noticed this too and found it very interesting. In halo wars, there was a dormant forerunner fleet inside of the shield world that the game took place on. This could insist that a forerunner fleet has been left untouched in Requiem and could greatly change the course of the campaign. Another theory is that a group of ancient humans(from the time of the forerunners) escaped to the shield world when the rings were fired and have lived there since. It says it is a native boy, so either humans have lived on Requiem, or this is a completely different planet. Now, i'm going to have to rethink all of my theories that i have come up with for the campaign