question about silkie chicks

[Teresaann24]

I posted some pics but my camera isnt of good quality but what i am wanting to know iv been looking at my chicks and i think i may have 2 roosters and 3 hens and i think my lil chick with my hen is a rooster cuz i caught him bumping chests with my rooster.anyways what im wanting to know is i was looking closly at there combs they are 7 weeks going on 8 weeks old. some may be a lil older but i was looking at there combs some have hardly any and some have very visable and very wide across the face combs none have turned red yet still all black so what do you think hens or roosters? i also saw 2 of my grey chicks bumping chests?

 

[IloveTravis]

The clear giveaway is normally the waddles.
I also noticed that my silkie roos had much more upright, almost "feathery" tails very young, while the hens had cotton balls. And my hen is very sweet and docile, why my roos are very skittish.
I'm no expert, but I don't think silkie combs turn red, either. Mine are much older than yours, and still very black in the comb.
I hoped I helped, maybe a little.