I'm very curious to know how new feral tribes form. For genetic diversity, I hope a pullet from one family forms a tribe with a cockerel from a different family.Yes that makes sense but it's not through hen pecking in feral flocks or jungle fowl. There is no pecking order as such in jungle fowl because the usual arrangements is one rooster and one hen. Their offspring may stay in the tribe for a while it seems from what few studies have been written about it.
Sometimes the rooster moves on to find another hen; other times a pair may stay together for nobody knows how long. There have been reports of chicken couples staying together for a number of years.
My friend in Finland has feral couples that have been together for at least six years.
While not really possible, cfonts is in the best position to observe feral groups.