I have all silkies and new introductions are tough. I have done the recommended "cage in a cage" method and it works most of the time. However, one time that didn't work so I had to take a different approach (hafta be smarter than the chicken, right?). I have a dominate hen in one coop and she wouldn't accept the newbie. Sooo, I took HER out and put the newbie in at night after everyone else had gone to roost (piled into the nest box). I kept her isolated for 2 weeks in a smaller coop out of sight from the others. When I put her back in the original coop she had lost her status in the pecking order and had to start over earning her rank. She was so busy bullying all the others, the newbie didn't get more than her share. She is "Queen" again, but the newbie is happily part of her court and all is well.
Chickens invented the pecking order. Humans just copy it.