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The very first one after your rooster could be a rooster, the surest way to tell would be catch them and check for the pointy feathers around their neck http://www.the-chicken-chick.com/2014/06/how-to-sex-chickens-male-or-female-hen.html?m=1

Not sure about your rooster, we always had a rake by the run door, but if he doesn't calm down within a week after the new hens coming in I would get rid of him, its not worth having an aggressive rooster, you only need one at the end of the day. As for the suspects, I think they are hens...