I know that as well, I can only assume they are in two seperate parts of the coding. I think the orbs are meant to be more like kill streak rewards, though more team based. The longer you stay alive and the better everyone plays, the more orbs there will be. If you die, it resets. I noticed it cause I saw a teammate generate orbs, moved past it, then in a clutch moment in the same area later in that map I noticed my super was close, and I remembered those orbs! I ran out of cover to grab them expecting to hit my foes with some space magic! But the orbs weren't there... I suppose it's possible I picked them up without noticing, but it makes the most sense to me they would dissapear. Otherwise every match would surely have a bunch of orbs just chillin, but you hardly ever see them in crucible.