I see no other reason to fully complete Onslaught if the rewards are not enough. By enough I mean at least a Holo Foil weapon getting higher drop chance during the activity or when you complete it. I love the Holo Foil effect and I want it on my considered god roll so I can feel like the effort was worth it. Since there is a score system, maybe tie in a higher droprate to a higher score the further along you are. It will simultaneously incentivize players to go pick up and dunk batteries while also giving them a better shot for the Holo Foil god roll that they want.