I don’t know how big that Frizzled Silkie is compared to the Wyandotte’s. Many Silkies are bantam. Once he hits maturity it won’t matter but it might make a difference now.
Some hens will squat for anything in spurs but many, especially those a bit more mature, expect a rooster to fulfill his duties before they are willing for him to be the father of their children. He needs to dance for them, find them food, break up fights and otherwise maintain peace and calm in his flock, look out for danger, maybe help them find nests, sometimes help out with the babies, just a wide assortment of different things. He has to WOW! them with his brilliance, magnificence, and self-confidence. Not all mature roosters do all of these but practically all eventually manage enough to be accepted as flock master.
An immature cockerel can’t manage these things so many of the hens won’t accept him. They may resist by fighting back or even chasing him down and beating him up. Many times they just run away from him when he tries to mate. Often the dominant hen will attack him if he tries to mate another hen, even if that one is willing.
I’ve had cockerels as young as five months be able to do enough of these things to be accepted by older hens, but that is pretty rare. My current one is seven months old and doing pretty well though there are a couple of the more dominant hens that still haven’t accepted him. They don’t fight him, just run away when he tries to mate. Still it is surprisingly peaceful down there with one that young and some hens over two years old. I have had a cockerel that couldn’t manage all that until he was about a full year old and he never did really WOW!@ them that much. Still, the eggs were fertile and the flock was peaceful.. Each male and female chicken have their own personalities and each flock has its own dynamics. Just changing one key chicken can often make a dramatic change in those flock dynamics.
As long as neither he nor the hens are bleeding, you did not make a mistake by putting him in there. Over time he will mature and gain the self-confidence he needs to be a good flock master. One by one, the hens will start to accept him. There is no set timetable for that to happen though. Each flock is different.
One more thing. The mating ritual is an act of dominance. The one on bottom is accepting the dominance of the one on top, either willingly or by force. The cockerel has to become dominant to be able to fulfill his duties. How can he break up fights if they turn around and beat him up? How can he tell them anything if they won’t listen? If they are the same breed, a five or six month old cockerel is usually bigger and stronger than mature hens. He will often try to force them to mate to establish that dominance. Size is not everything in chicken dominance. The spirit of the chicken counts for more. That’s why you often see bantams dominating full sized chickens in the pecking order. Some mature hens have enough spirit to dominate a year old rooster. But most don’t. When that cockerel starts to try to establish that dominance it can get pretty exciting in the flock. As long as no blood is drawn, it’s OK. They will work it out.
I feel sorry for him.... 
