Don't worry. Your flock will recreate it's order. They will mingle together again soon. Once your girls are receptive, it will get better. I was feeling the same way. But they have figured it out. They are back to a happy flock. ♥️
I'm assuming you have them as pets. You will need to find some way to separate him if he as as large as you say. But I will tell you ( owning a young cockerel myself) that his mating tactics will be quite aggressive until he figures it out. I doubt he will injure them unless he is massive...