The last one is definitely a rooster. You can tell by the streamers (longer feathers that sick out of the crest) and the comb. The comb is way too big to be a hen. Maybe he doesn't crow because he's lowest in the pecking order. The "red" one looks more like a buff color to me.
And you're...
Are you sure one silkie is a hen? Couse in the 2nd picture all 3 look like roosters to me. Do you have any better pictures of them close up?
Silkies go broody a lot. My silkies are pretty good layers. Eggs are small, but enough for me since I don't use eggs much. I have 3 silkie hens + another...