It might be true what your saying but if you download a RNG app and have it randomly generate numbers 1 through 100 and repeat this 100 times or even 500 times and you will notice that the number 42 might pop up 10 times where as the number 43 never pops up until you've run the RNG 673 times lol. Now we know bungie uses a RNG system so imagine each number has a gun assigned to it and you quickly figure out why you haven't received certain guns.