It’s hard to know just what the behavior is if you are not there watching in person. A lot of that behavior is normal and natural. The part that is worrying is the grab from the front and drag around. It may not be nearly as bad as the OP made it sound. It sounds excessive, more than the normal behavior I see in my flock, but again it may be within acceptable bounds. I just don’t know. As Sumi said, some of this is not for the faint of heart.
Another thing is that he has supposedly singled out the molting hens as his main target. A hen that is laying sends out signals to a rooster that she needs to be fertilized. An easy one is that the comb is normally bright red when they are laying and lighter colored when they are not. So this is purely about him forcing his dominance on the older hens. It’s purely a dominance issue, not really anything to do with mating. The older hens are the dominant ones in the flock. Those are the ones he is trying to take control of the flock from. Instead of all the Red Rocks, I’d guess it is probably just one or maybe two of them, the dominant ones.
The reason I suggest isolating him for a while is that he will mature. Once he matures he will probably be able to dominate them more by personality than by brute strength. The mad rush if hormones will be over and he will be in better control of himself. He will probably behave like a mature rooster and the hens will be a lot more likely to accept him as flock master. Often when a mature rooster is introduced to a flock of mature hens they pretty much accept him without all the drama. He just come in, mates a few, and bang, they are his flock. The former dominant hen might put up some resistance but even that does not always happen. Quite often they become best buddies. It’s not the pecking order that is being established, it’s who is to be the master of the whole flock. Who has the responsibilities to keep peace in the flock, find them food, fertilize the eggs, watch for danger, and all the other things that a good flock master does to take care of his flock.
I know this sounds patronizing and maybe it is, but not everyone is meant to have a rooster. Some people can’t accept the normal flock dynamics of a rooster becoming the flock master, especially through the adolescent phase. It’s just too upsetting for them to watch. The transition of a more mature rooster becoming flock master is normally a lot easier to watch. A whole lot of the drama just goes away because he does it more by personality than by brute force and the hens normally resist a lot less. Since the OP said the rooster is expendable I personally think that is the best option. Just remove him from the flock and all the possible issues of having a rooster go away. As an alternative, ease the transition and make it easier to watch.
Another thing is that he has supposedly singled out the molting hens as his main target. A hen that is laying sends out signals to a rooster that she needs to be fertilized. An easy one is that the comb is normally bright red when they are laying and lighter colored when they are not. So this is purely about him forcing his dominance on the older hens. It’s purely a dominance issue, not really anything to do with mating. The older hens are the dominant ones in the flock. Those are the ones he is trying to take control of the flock from. Instead of all the Red Rocks, I’d guess it is probably just one or maybe two of them, the dominant ones.
The reason I suggest isolating him for a while is that he will mature. Once he matures he will probably be able to dominate them more by personality than by brute strength. The mad rush if hormones will be over and he will be in better control of himself. He will probably behave like a mature rooster and the hens will be a lot more likely to accept him as flock master. Often when a mature rooster is introduced to a flock of mature hens they pretty much accept him without all the drama. He just come in, mates a few, and bang, they are his flock. The former dominant hen might put up some resistance but even that does not always happen. Quite often they become best buddies. It’s not the pecking order that is being established, it’s who is to be the master of the whole flock. Who has the responsibilities to keep peace in the flock, find them food, fertilize the eggs, watch for danger, and all the other things that a good flock master does to take care of his flock.
I know this sounds patronizing and maybe it is, but not everyone is meant to have a rooster. Some people can’t accept the normal flock dynamics of a rooster becoming the flock master, especially through the adolescent phase. It’s just too upsetting for them to watch. The transition of a more mature rooster becoming flock master is normally a lot easier to watch. A whole lot of the drama just goes away because he does it more by personality than by brute force and the hens normally resist a lot less. Since the OP said the rooster is expendable I personally think that is the best option. Just remove him from the flock and all the possible issues of having a rooster go away. As an alternative, ease the transition and make it easier to watch.