i agree with Happy Chooks. Any hatchery would be the luck of the draw. Many of them do start off somewhere as a breeder's flock, for example, Estes Hatchery bought all of Calicowoods Welsummers. Now it has been several years, guessing four years ago, and it may be three to four generations back to the original flock. I do not know honestly if they do cull to standards but I was not too please with the vigor on the chicks when it was second to third generation from the original flock they had. All of them died before they reached their laying age.
Stick with a breeder, they have better examples than the hatchery. If you want to take your chances, go ahead and make a backyard pet out of them. Most of the BYCers and WCNA members usually are the better ones out there. Do your research!
Welcome to the Welsummer thread...there is alot to learn from each other!