Im thinking that CJ and Saul are using encrypted police cb's and thats all there is to it. I don't think anyone is meant to read into it as much as we are right now.

It seems more likely to me that if the colony, i.e. mallers, were to rediscover Saul it would be through some other form of communication. Knowing Saul the way we do he is more likely to just contact Scratch himself. She doesn't need to find him, he'll find her.