Right now I have 9 girlz and 1 rooster. If I add hens it is only 2 or 3 at a time. I employ the usual protocols for adding new hens by separating them for a week or more so they can see each other etc. It's trouble to divide the coop in half but that's what needs to be done is adding new hens. I was wondering if a different way would work just as good. I found 2 year old wyandotes that someone want to rehome because they are not laying well due to age and molting. I would like to add 5 of them to my coop. After I quarantine them to make sure they are healthy could I just add them to the existing flock without separating them? I'm wondering if the new 5 will integrate easier because I'm adding 50% to what is already there and not a smaller percentage. The coop will hold everyone with the 4 square foot minimum per hen and my outdoor runs are huge and there is plenty of space to hide and not come in contact with each other if they don't want. I plan (with guidance from my chicken friends) to introduce the new chickens at night and let everyone out very early in the morning. The the new and old are the same age roughly and size. What are the flaws in my plan? I really need to get a second coop.