The problem seems to be that the 40% dmg buff exotic primaries got is first of all applied not only on primaries and secondly seems to be working against other players in Gambit. You can two tap with graviton lance or polaris I think. One hit body shot with arbalest, queenbreaker, lorentz and erianas. One hit headshot with sturm or le monarque and trinity ghouls chain lightning instakills from what I read. So it's a mess. Basically what momentum control is.