If you do end up getting a pair, I would get bantams so you can argue (if anything happens) that they are one third the size of a normal chicken and take up less space :)
so you can say your bantams only make up one standard chicken, lol (:
It should be fine. Pecking and attacking will be normal, as they are establishing the pecking order.
-Have you considered a rooster (*if your state allows it)? They are great protectors as well.
- Make sure the new chicken is about the same size as the rest, (not including the bantam...