I think it is likely that the Evil Shiro in first episode who shot Tatara is indeed the evil colorless king that Kuroh is supposed to kill and he was going to meet the Silver King that night on the roof top. Perhaps the new Kings meet either the Silver or Gold Kings? Or Evil!Shiro is actually Silver Kings son but was raised by his mom who works under the Gold King?
Perhaps Silver King and Evil!Shiro met and some how exchanged souls. I also wonder if there is any relation between Tatara and Silver King.
I liked how the Blue King is trying to solve the mystery. Hopefully the Reds - Homura don't start randomly attacking people and use their heads as well
I wonder if the Gold King is also involved in his some how.