What a sight and experience to behold!I agree with posts that say letting the young rooster sleep with the broody isn't a good idea and will lead to something happening sooner or later to the eggs.
I have a lot of extra roosters that are kept in a bachelor pen away from the hens. Over this past summer while dealing with broodies and chicks I had a chick get separated from it's mamma and wind up in a pen with a bachelor Welsummer rooster. I was amazed that I didn't discover a dead chick when I discovered the escapee. Nope, chick was with the rooster and the rooster was tidbitting for the baby and watching over him. Idea! I put mamma and the babies with the gentle Welsummer rooster. Suddenly, Mamma and babies had a defender. He would lead them around their little pen standing guard over them, find food for them and at night would sleep next to the hen on the floor of their coop. The rooster had a job and was very good at it.
Even after mamma went back to the flock, Daddy Doc as he is called stuck with the fledglings and daddied them in mamma's absence. He did that with two broodies and one bunch of incubator fledglings for me.
Perhaps that would be a job for your low ranking male once the chicks have hatched. Until then, move him to another pen where he won't be picked on. Another lower ranking male to keep him company.
Either way, he needs to be somewhere where he isn't abused by the other roosters. They can't all be Alpha.
