Yeah I agree number two definitely looks like a little cockerel. You may have lucked out with pullets for the rest. The white satin and the black silkie to the right on picture #9 have crests that remind me more of a cockerels seeing as they are more swept back but that can happen in pullets/hens as well if they have smaller crests. The combs all look pretty small so I'm leaning more towards them being pullets, MadamPoofyBrow brings up a good point about the wider comb base but by three months I would think there would be a bit more comb development in a male (sometimes they are late bloomers though). 
As far as what satins are I've done some research in the past. Here is my understanding of what they are.
Basically they are bred to the exact same standard as a regular silkie (except they have either smooth or frizzle feathers that are not silkied) and in lines where they are fairly far along in generations they are genetically almost completely silkies (99.9% + silkie). I believe cochins were bred in to start them (to get smooth and frizzle feathering).
Many breeders who have satins will mix their silkies and their satins since other than feather type they are pretty much the same.
Silkies are a recognized breed while satins are not. Many breeders hope to have them recognized in the future and are working on it.
I'm not sure how many generations in you have to be in a satin project for it to be considered a satin.

As far as what satins are I've done some research in the past. Here is my understanding of what they are.
Basically they are bred to the exact same standard as a regular silkie (except they have either smooth or frizzle feathers that are not silkied) and in lines where they are fairly far along in generations they are genetically almost completely silkies (99.9% + silkie). I believe cochins were bred in to start them (to get smooth and frizzle feathering).
Many breeders who have satins will mix their silkies and their satins since other than feather type they are pretty much the same.
Silkies are a recognized breed while satins are not. Many breeders hope to have them recognized in the future and are working on it.
I'm not sure how many generations in you have to be in a satin project for it to be considered a satin.
