Yes, why I have my Rooster, Lester the molester ...lol...my Flock is totally closed...I have a mixed flock. My silkies are defiantly at the bottom of the pecking order, but they get along fine.
I would beg this person to avoid new chickens like this. I wont even buy chickens from breeders anymore. That's why I got 2 silkies. I will buy new eggs, and let mother nature incubate them, or just hatch from my own flock.