When Cyrus is making his speech to the gangs, and explaining his plans for taking over the city, he says, "You are standing with 9 delegates from a hundred gangs, and there are a hundred more. That's 20,000 soldiers." Well, 9 times 100 is 900. Another 900 is 1800. Even if you round off to the nearest thousand you only have 2000, not 20,000.