The idea was proposed a while back in this season when we were introduced to THE COLONY that there were three factions that may engage in war; Mallers, Tower, and the Colony. After listening to We're Not Dead I realized that there may be a 4th faction we have not thought of......the Zombies

The reality is that they ARE organized as we saw at the ARENA.....there may be a few zombies that are capable of some sort of cognition but that may be worse for the survivors. If there are a few zombies like the "colored" one at the arena who can control the minions out there (Jumpers, bohemoths........) this may force all of the survivors to come together to take down the huge zombie army.....

With that said, could there be seperate Zombie factions? Are the Doctors that skittles mentioned seperate from the guys at the arena?