The more I think about it, the more it all fits together. We have the Colored One, who kept a stronghold of biters and food at the arena (he also like to play with his food), then we have the One in the Pin-striped Suit, who actively goes after the threats to any biters and seems to be creating or morphing biters in Cain General. I think they have two factions that don't actively go after each other.

Think of this, Skittles says that the Colored One is in the Arena. Pin-Stripes shows up at the tower and at a further west point on the map. Colored One is Tattooed from head to two (most likely). Pin-Stripes can pass for a human (i.e. the tower mistaking him for Paul). The Colored One was at the Arena when Datu and Kalani were rescued. Pin-Stripes was in the Tower when the rescue team got back from the Arena.

Two biter factions in two different locations. We need a territory map for their area. Also, I believe that Pin-Stripes came from Ground Zero and that the Colored One is Bill Roberts.