When I read the part about pocket dimensions, it reminded me of the exotic weapon Pocket Infinity. The description says, "You cannot shake the feeling that this is less a weapon than a doorway." And in the grimoire for the Vex Slap Rifle, "...In non-combat situations, the Slap Rifle seems like it might serve as a viable field transmitter, construction tool, navigational beacon, network repeater, or any of a number of other utility functions." Pocket Infinity grimoire, "Fireteam Tuyet died in the Ishtar Sink, hunting the secrets of the Vex. They must have come too close to something precious...The data they gathered helped forge the Pocket Infinity..." I think that something, that they found was a way to traverse the different pocket dimensions and/or Vex networks. The Vanguard interpreted the data as a way to make a weapon but what if it wasn't meant to be just a weapon? The Vex meant it to be a multi-functional tool but all the Vanguard came up with was a weapon.