This could be an option if you are comfortable eating your roosters, then you know they won't get used for cock fighting, or eaten anyways, and had a good life. Personally this is not an option for me because I get too attached, and based on the way you described them and are asking whether or not you need to rehome them instead of just going for it, it seems like you wouldn't be comfortable with it either. However if you ARE comfortable and I am very wrong, then you would know they had an amazing life and were killed humanely.