Rehoming boys is hard, trust me I know. You did the best you could for Pecan and Biscotti. You found them a home with someone who wanted a rooster for their flock. Now it is up to them, as hard as it is for me to say. This is my mindset when I have to rehome the extra boys. I did my job, tried to find the best home possible for them, now they either behave and make it work or they do not. We both give our boys a chance, that is all we can do. Now, as far as your remaining boy, it is good to hear that he is calm and mellow, that is in his favor. Remember though, very, very, very soon, hormones are going to hit. They are going to hit hard and fast. The idiot phase is coming, and it is coming without a older established rooster to keep him in line. He is going to loose his mind at times, he may get rough with the hens at times. My advice, as long as he does not turn on people, give him time to out grow it. He will start calming down at about a year, and be golden by 1 1/2 years. Once he is established, if you want to add another boy it will be easier. You will have him for the new boy to watch and learn from. You will have older hens who will think nothing of putting a new boy in their place, and have back up if needed from your boy. You will find that if they can learn from a older boy adding other roos is soo much easier.