Separate flocks coexisting

[Stitchaquilt3]

I raised 9 new pullets this past spring and one of them is a rooster. I didn't know this until after I had introduced them into my existing flock. Now at 16/17 weeks old it seems I have two separate flocks. When I turn them all loose to free range in the afternoons each group heads in opposite directions. When in the run they seem to mingle some but still it's obvious I now have two separate flocks.
When roosting at night each group is at opposite sides of the coop.
Should I consider a second coop to avoid problems later on

 

[JacinLarkwell]

I raised 9 new pullets this past spring and one of them is a rooster. I didn't know this until after I had introduced them into my existing flock. Now at 16/17 weeks old it seems I have two separate flocks. When I turn them all loose to free range in the afternoons each group heads in opposite directions. When in the run they seem to mingle some but still it's obvious I now have two separate flocks.
When roosting at night each group is at opposite sides of the coop.
Should I consider a second coop to avoid problems later on

Honestly, it can go either way. Sometimes the male's get along, especially if dominance is established early on, sometimes it goes sour

 

[Mrs. K]

You just have a sub flock of immature birds. Very normal, about the time the pullets start laying, the sub flock will be gone.

 

[AinaWGSD]

Like @Mrs. K says, subflocks like this are perfectly normal. Think of it as how like at a family reunion the kids and teenagers usually hang out with each other instead of with the adults.