Here's a thought. What if someone (I'm looking at you, Rush) FAKES using the stones in order to make people on Destiny think they're not really there, in order to spy and see what they talk about when that person is not around? Nobody on Destiny has a way of telling that someone is really possessed by another person. It's just their word of honor and their altered behavior.
I imagine it'd be quite creepy to see Rush pretend to be a random scientist visiting Destiny to examine the ship, all the while listening to what everyone really thinks of him (not good), then at the very end see Rush go back to the stones, put them in the case unused, and sneer.
I imagine it'd be quite creepy to see Rush pretend to be a random scientist visiting Destiny to examine the ship, all the while listening to what everyone really thinks of him (not good), then at the very end see Rush go back to the stones, put them in the case unused, and sneer.