Yesterday something came to my mind, which comes near to what you have written there.
I don't think the Survivors will abandon The Colony - because of the ressources and the logistics there. But in #36 they have realized that them zeehs come to where the big numbers are. So splitting up might be a good means to keep low numbers; the 'network' of safehouses and police-radio, which was set up by CJ, might come in handy for this.
The flaw of this theory: This would make the Survivors a lot more vulnerable - especially in situations where huge numbers are important!
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