I have found that if the silkies are in with the larger birds from day 1, they respect each others space. It seems like when you try to introduce them to each other as they get older that the silkies get squished!
I had two day-old Silkies with 4 other LF day-old chicks in a brooder space and the LF chicks grew larger and faster than the Silkies and picked on them. The Silkies were having to hide all day from the LF chicks. The Silkie chicks had to run out from hiding to get a drink or feed. That kind of growing up has got to be stressful for the little Silkie chicks.