6-8 week old silkies sexes? Pic heavy

[ND Sue]

I know, I've read I won't know for sure until someone lays an egg or crows, but are any of these chicks showing any sex characteristics at all, either way?

None have the long feathers behind the head. A few seem to do the rooster sparing and then those same ones will hide under some of the others when scared and that is supposed to be a hen trait isn't it?
Anyway, here they are!

same chick, side view head:

Thanks for any help you can give!

 

[GotChicken?]

I would hazard a guess that the birds in pictures #4 and #6 are roos, due to the tail and crest feathering. I understand your pain; I have two 7-week old Silkies that seem male one day, then female the next.