I actually think local limits of 4 is just ridiculous! I really believe you need 3, but 4 is better - for a minimum flock size. So if you are restricted to 4, lose one and the others are elderly - you can only add 1?? You never should add a lone chicken (intentionally ) if possible. But, if you add 2, you are 'over' the limit! Crazy!. I do think the 'purchasing' part should be a min of 3 or 4....but you should be able to have at least 6 chickens. 3 is not a flock, imo (or, bare minimum of a flock, and if all 3 aren't cohesive, it means one is always left out.)
Oh, well. God forbid we make rules that make sense in the big scheme of things.

Someone might be upset about the egg song, for pete's sake. Everyone should know where their food comes from. Have to smell a
bit of cow poop at times when the wind is 'unfavorable', hear an escort song, or a rooster greeting the day or calling to his ladies, etc. Not that you want it to be excessive...just a mild reminder of all things life and reality.....