Likely molting right now! With silkies, you aren't going to SEE bare spots or much evidence of molting. (at least, I don't on mine!) Mine are molting and look just as fluffy as ever-- but their pen looks like a feather pillow exploded in there! But to check over the birds, I can't tell that they are molting, I can just see the fluff everywhere on the ground, stuck in the fencing-- looks like snow! If he has the type, wings and feet you want, hang onto him. By bringing in another boy, you could be bringing in issues you already have worked out. Once molt is over, I'd just do AI with him. I don't even bother anymore with relying on natural breeding. It messes up my girls when I'm still trying to show, and I don't want to trim up my boys. When I'm breeding, I bring them all into my garage and put them in pens. I mark on eggs who is who, and what breedings I'm doing. Then when they hatch, I know who the parents are. I rotate my breeders out so I don't load my incubator up with lots of diff parents and then have chicks hatch and won't know who is who. I have a small incubator (Brinsea Octagon), so I don't have a cabinet that I can put them on different shelves to sort them like a lot of people do. I think next on my list is another Brinsea!
I use Wazine in the water while they are molting. I just did my layers and silkies about 2 weeks ago when they started to molt.