Actually, I'm starting to think this "more than one Demon King" may be for real.
I think that captured Demon King isn't Rood's former form, but another Demon King. I mentioned this in the chapter discussion thread. It's starting to make some sense as to why that captured demon, in Rood's subconsciousness, called Rood his "brethren", but that word can also mean "brother". Interesting how this all works out.
What if DemonKing!Rood had a Demon King brother?
As for the orbs? In the current episodes, I think that orb is from their glowing circle? There are a lot of orbs floating around in the Tower. I thought that represents mana?
As for the yellow orb, I thought that may be the tracker that Mikel threw on Dio? Possibly? I don't know for real....
Read more: http://blackhaze.freeforums.net/thread/94/king-more-say#ixzz4TVAg2MlR