Females can be aggressive too.I’m 100% sure I’ve only gotten eggs from 1. I let them free range in the yard & she was always the only 1 in the roosting box until she went broody then he was in there right beside her.
They both flap & screech but he’s aggressive & does it more frequently. He’s also attacked the fence when my dog & cat walk by. Protective of her but now especially since the chicks r here. He started attacking the scoop that I use in the pen whenever I’m nearby. lol
Have you checked anywhere else for a hidden nest?
Was the bird in question aggressive only when broody, or all the time?