I think Rasputin shrugged and let humanity fall so it could survive, regroup and fight but at great cost. THE GARDENER I think is the heart of the black garden. The Traveler came to wipe us all out and between Rasputin and THE GARDENER (the heart of the black garden) we struck The Traveler dormant. THE GARDENER didn't shrug and thus the Vex still have their army and are regrouping. This is assuming the 'leak' about the former plot is true and that the speaker and ghosts have covered up what actually happened and that the Traveler is actually the darkness we took down.