I have a flock of 8 old hens, and 6 new ones (7 weeks old). I recently cross-fenced the run and put a little doghouse in to serve as a coop for the youngsters, with the idea that they would introduce themselves through the wire for a while. My daughter wonders why I don't take one of the old hens and put her in with the babies? Rather than putting the babies in with the old ones. Any thoughts?