Pretty sure I win this thread. While attempting to get vex mythoclast (which itself took 37 hard mode atheon kills before I got it) I once got 3 vision of confluence rifles simultaneously from an atheon kill. Not only did I not know this was possible, but I have never heard of it happening to anyone else. For the record, as great a gun as the vision of confluence is, at the time I got this loot drop I only had 2 guardians and both of them had their own maxed vision of confluence already.