It seems that it is more important to have a "perfect" rooster because he is influencing all of the offspring. If you hatch 100 eggs, all of them will have a portion of his genetics. If you hatch 100 eggs from 10 hens, only 10% will be from your hen. And you will still be able to select from the nicest of those 10.
I didn't realize this until I started breeding, that roosters are more valuable than hens....in terms of breeding. if you know what I mean.
If you have a perfect rooster, then you will be heading in the right direction no mater what you do that year.