Ok this is my theory and just a cool connection I think ok Let's begin who played halo 3 odst and saw the destiny Easter egg I did so in destiny they talk about the fall what if master chief died during a big ATTACK form the FLOOD ik ik just saying here theory so in the opening scene you see the mountains move or shift this could represent time moving and each step is like a day back on earth and there was a big ATTACK on earth and this was the fall master chief is dead gone a legend and there are monuments to honor him such as on Mars that Easter egg and in halo sometimes it said you died to the GUARDIANS! what if the guardians are trying to communicate with the past or the tracker is trying to get back old relics of the golden age this is just a theory