The idea seems to be to take out six targets quickly, and I'd say every kill should generate an orb. Otherwise, it's just not worth the long wait for it. You can have Golden Gun do precision damage for both subclass nodes while having one for close ranged, quick blasting vigor or a single condensed shot with extreme range, penetration and causing an explosion upon a kill or damaging an enemy. So one that focuses on more of a Quickdraw, quick kill and then one that focuses on precision and a well-placed shot Idk, the damage needs to be better imo