Does it truly matter who drops what? They were saying Rixxas, Archon Slayer, would drop that legendary/exotic heavy machine gun, and he is the second mission. If he will actually drop anything like that in the real game, will be seen. However, if I can pick up a random encrypted engram, and a high enough level Cryptarch can turn it into an amazing piece of gear, I am not going to complain. Also, a random drop will feeling amazing, as opposed to grinding out the same boss, strike, mission, event, or even a raid to get a specific item.