Yes, I agree that the holes in the Ador1 will not really add anything to the ventilation of the coop. I was thinking that it would just be drafty, with the roost right over it, for chickens trying to keep warm in the winter. I have insulated the coop (except for all the ventilation at the top!), but have no electricity to it, so no heat source other than the chickens themselves and the composting deep litter. I had been hoping that the chickens would be snug in the lower part of the coop, but the holes in the door right under their roost seem to make that more difficult. So I was thinking that a way to cover them up in the winter at night might be useful.
But really, I have no idea how a winter will go with chickens. So maybe the holes are no big deal, and the chickens will huddle together and be fine. I was just disappointed when I installed the door and thought about the holes, because my great plan for keeping them warm in the winter isn't going to work as well as I thought it would. But I'm making it all up as I go, mostly using info I've gotten from this site. It seems like chickens are pretty hardy, and I did try to get cold-tolerant breeds, so we'll probably be fine.
We don't have particularly bad winters here, but from what I've read from everyone else that is in the north, the bigger issue is going out there to take care of the frozen water and to feed through the knee deep snow.