I thought I already said that the bunker hive were clearly security gaurds, as the only defense Rasputin would have otherwise would be the completely clean and shiny front door with no signs of battle. Also, where did you get the info that said the Hive were attacking before/during the Collapse? I thought only the Vex had started to attack before the Darkness came.

Play the story it said they gave up the moon during the collapse because of crota before they got to earth so that would mean that Rasputin would still be fine before the darkness got to him