Year 10 should be the speaker and the traveler that turn out to be consuming light for their gain.Everyone in the tower would join in the fight after they moved away from the tower and forced the traveler and the speaker out of earth and towards the outer solar system or maybe another solar system as a whole.Cayde will finally be able to fight again after 10 years and each vanguard leader will guide their class along with the help of 2 others that specialize in other subclasses (Cayde gets a girlfriend) At the end since there will be new consoles that handle more stuff all of the vanguard leaders will lead their class into battle and recreate the collapse