You may be on to something. In all my playtime I've received 3 MIDA Multi-Tools 3 Icebreakers, 3 Hard Lights, and 3 No Land Beyonds, 3 Masks of the Third Man, and probably multiples of other exotics that I can't recall. I have had Gjallarhorn drop one time (Thank Odin!), and have never had the Suros Regime or Red Death drop.