Your Partridge Silkie is definitely male. Need better photos of your Easter Eggers. Full body shots with no hands in the way. And they are younger than 3 months. They still have a bit of chick fuzz lingering on the head, which puts them around 6 to 8 weeks.
I agree that Silkie is a cockerel, and that we need full body pictures of the others to be able to see hackles, saddle, and sickle feathers especially.