UPDATE: Took the divider out 2 weekends ago. There was a little chasing and feather biting but they are doing very well over all. The hens rule the run and chase the littles back inside but there is food and water in both the coop and run so it's not a huge deal right now. They seem to be getting along pretty well. Thank you everyone for all the advice and ideas. I think the "see no touch for a week was a huge contribution to how well it's going.