I have 2 separate flocks and split free range each day, only because my Marans run is shaded all day. Once I extend it out past the barn I will free range each flock every other day. I keep each of my roosters with each flock and its been working out so far for going on 3 years.
I would get that Marans boy some BCM ladies... He's a very handsome fella.
I see a very slight halo but that could just be lighting, would love to see more pics of him.

 Friendly info... it's never Maran. Always Marans. (Singular and plural)