Everyone has different opinions, rightly so, as we all have different set ups, but you asked for mine, so here they are:
- 4 year old hens are old hens-keep the dominant one if you want, I am keeping Mrs. Feathers. But 4 year old hens are just health issues waiting to happen. (I do know that many many people on here keep hens until 8-10 years, but I have never come close.) A lot of hens are apt to start dying from what I would consider old age. I do know this is hard to do, I have 3 in my yard right now, that should make the soup pot. I will love to have my own home canned broth, and chicken soup on my shelves...it is just the doing of it.
- I have never had a dominant hen be that good at flock management. Might be my country. When I free range, I truly range with coyotes, bobcats, hawks and eagle and coons.
- The two pullets that are hanging out with the rooster is because they are laying are higher up than the non laying hens. So I question if that hen is still dominant. When they leave the flock like that, sometimes that can be a sign that something is wrong and may die soon. Not always, but... she is four years old.
- If you remove the rooster, it won't have any long term effect on the pullets.
I do like a multi-generational flock, where the birds are different ages. My ideal goal is to have a bird 4-5 years old, 3 - 3 years old, 3 - 2years old, 3 - 1 year old, and the current years chicks.
And a good rooster, but not all roosters are good ones, I only keep a good one.
This year, I am pretty close to my ideal. But I have had coons, wipe me out, coyotes take everything but 3, and have had that happen multiple times over the years. Once weasels got me. I just kept working out my system, and now, finally, I really have a predator proof set up.
I guess my best advice would be, you just keep fiddling with it, sometimes you get more chicks, sometimes the chicks are all roosters, sometimes the chicks don't live. Sometimes you get a bird that does not work in your set up, sometimes you get other problems - just keep fiddling with it.
Good feed, clean water, adequate shelter and the reality that they don't live forever, and a merciful end can be a gift.
Good luck,
Mrs K