Roosters are difficult to adopt out. You will want one rooster for about 10 or 12 hens. If you have MORE roosters than that ... it is OKAY so long as they can coexist (lots of info on this)
Extra roosters are very unwanted and although you should try as hard as you can to adopt out, a person willing to take them might be doing so for their table, which, if there Is no other solution, at least the life given nourishes someone and is not wasted.
You will want to decide which rooster to keep and it depends on your circumstances. If you have small children, you don't want to keep an aggressive rooster. But if you don't, then you want to keep the rooster that BESTS MANAGES THE FLOCK. Keep the one who watches out for predators, the one who offers treats to the hens, the one who does a mating dance for the hens rather than just jumps on them, etc.
*if* you realize that there are no other solutions for the extra roosters other than someone's table, I strongly suggest learning how to butcher one of the roosters yourself. I know that for some this is a hard thing to consider, but if you are a first timer at it, I promise it will be an experience on a physical, emotional, and spiritual level. If you do end up butchering a bird, an adult rooster is tough so I recommend a slow cooking stew.
Let it be the last possible solution if there is any chance he can be adopted out. Repost this on the thread on BYC for re homing chickens. Since it is a heritage breed, you may want to contact your local 4H to see if any are interested.