Well, you don't necessarily need to have 10 hens for one rooster, I have only 7 hens currently and 2 roosters. They all get along fine. It all depends on each roosters individual personality. If you keep him there are the no crow rooster collars that prevent roosters from crowing, but I wouldn't recommend them unless you did all your research and got the right one because certain ones can hurt roosters. I would suggest at least 3 hens for him if you where to keep him and if you didn't, i'd suggest getting one pullet that's VERY close to your existing pullets age so she can have a companion. If you didn't get one close to her age she could peck on the younger one, or the older one could peck on her, that's called the chicken pecking order. Chickens really should be kept in flocks of three or more, but two pullets will be fine. Do you have any other questions?
I have two roos for 28 hens and one of them is still pretty rough with the gals. The roosters do well since I raised them together. But mine are barnyard fowl, not house chickens. Where do house chickens roost?