No you dont need it if they are free roam, because they will have alot of bugs and grass to eat. But try some crushed oister and some or just a little bit of grain feed for the winter or if they are broody.
Talk calm to the bords and try to keep them as a group corect any bad behavior that you dont want.thats just an imput i dont have much experience so be aware that this is some random person that you dont know govong you information.
Craiglist is a good place and obviously you wont kill him he does seem like a good rooster so see if you could give him away to a freind or a neighbor that might want him then that is what i would do.