None of your photos are showing the comb - need to see from the front, with crest held back . Have you been trimming crests, around wings on the first one or is it molting? Silkies should have full crests (females anyway) and silkie feathering around front and back of neck etc. Are these hatchery silkies and how old are they in photos?
Very hard to judge when we can see but, not touch . The way the crest looks(trimmed) on the first one looks more like the crest on a polish.