Does it have a roof and wind breaking walls?We actually do, 10ft x 20ft.
It's when frigid temps and/or high winds and/or lots of snow fall happens mine stay in the coop for days on end. ChickenCabinFever is real, and it can get ugly.
Probably, since the current space isn't good for integration.However, if that's not enough, maybe keeping the new pullet and cockerel in the garage would be best?