You're right that there really isn't a ton of orbs all around in crucible, the times I remember orbs all over may have been when I was on some streak with no deaths which is rare since I suck. Although I do seen to get that 10/1 bounty somehow everyday of banner. I guess it's also possible that they get picked up but yeah I wouldn't be surprised if I'm confused. Going to grind some marks for the Rapier crucible vendor scout later so I'll have to find an orb, die, and come back to check.