Peaking order and roosting during cold nights

Hi Folks, I have just gotten a flock of hens that have been divided out of a bigger flock. I have seven total. It has been a week that we have had them and I see that they are establishing a peaking order. I live in Minnesota and am thinking about cold nights to come and am wondering about how the peaking order effects roosting. I have two or three birds that always roost on the window sill and the other four or five are on the roost. I have multiple bars at different heights that the 4 or 5 birds roost on. I am mostly wondering if the ones that roost on the window sill will roost (or be allowed to roost) with the others when the nights get colder. I cannot tell who is who at night really and I am not sure where the ones on the window sill are on the peaking order. Also, I am wondering if I should make a proper roost bar in front of the window or not. I would rather they joined the others on the roost. There is plenty of room. Any experience or advice would be helpful. Thanks!

 

Thanks for the tips. I do have wide roosts and the window group has move from the window. I now have 4 that roost on the highest roost, two on the second one down and one lower. Sometimes it is different though and there are three and three and one. I cannot tell if it is the same one that usually alone. I did have one that was roosting high in a unintentional roost spot but I covered it up. I wondering if this was the loner, but I would be surprised that she was a load to be higher than the others. There is not one bird that is obviously the lowest on the pecking order. There are defiantly a couple though. I wish I could know if that one is choosing to roost a lot (if it is even the same one) or if they are not allowing it to roost next to them. It is starting to get cold and I worry about them. Not sure if there is much I can do though.