So you don't use Nightstalker that often if you don't know Way of the Trapper has Keen Scout which grants Enhanced Radar. It splits the pie pieces of the map further and extends it to blip at a further distance in addition to the tracking features on tether/items. You mean the Warlock exotic that requires you to stand in the rift and not move or you lose it? That Warlock exotic? The Lucky Pants change is because of Ace of Spades, the two abilities conflicted as it essentially gave infinite Memento Mori as the reloaded bullet broke so the stacks never dropped. Dragon's Shadow also used to only reload your equipped weapon but now its your stowed weapon as well, if they let it proc reload perks you could easily stow a kill clip weapon and proc from that for your equipped. Plus you're already getting both your dodge features at the same time if you're using Gambler's, reload+melee regen. Ophidia and Sixth match Armamentarium since it only charges one grenade (the second charges slower) at a time. You can also mod for increased class ability and melee regen on top of the exotic, hence the change. It's a mechanical change to accommodate for mod versatility. You also failed to cover Sealed Ahamkaras or Stomp-EE5.