I sort of agree I think that everybody has their own randomly generated drop table to others and you will only get the weapons assigned to it But... I could be wrong also Me for instance hundreds of hours put into this game and hard light and Suros avoid me like the plague I'm not even collecting exotics I have gally Thunder and ice braker and I allways get them dropping from me all the time but those 2 guns never ever have they dropped It might be completely random but like he says the people that have certain guns don't have the ones they want or they just refuse to drop for them