Well let's assume that all of the guardians know about the dragon balls then? They wouldn't know how VoG or Crotas end work,they would be forever lost in the dark corners of time. You lost, so you decided to make your post exclude the thing that made you lose.
English
-
They could instant transmission out of the the vault after they kill atheon with and elbow to the guy in one blow atheon wouldn't even know what happened to him it would be so fast.
-
can they breathe on Venus?
-
Getting lost in the corners of time is just a game mechanism used to reset the mission. Nothing lore related at all.
-
Actually it is. In lore terms you are literally flung into another timeline ruled by the vex. There is no escape except through the portal.