Tail Feathers at a week old?? does this mean its a pullet??

[Lacey1988]

I recently put a picture of a Dark Cornish chick and I was wanting to know the sex but it was too early but Ive notice today that its done grown tail feathers and its only a week old well actually 6 days old lol....but doesn't it normally mean its a pullet or is it wishful thinking on my part

Also could yall tell me if these are girls or boys their supposed to be girls but sometimes they sneak a roo on ya
Pictures are all of the same two

 

[Ladybird CA]

Hmm they look like girls except the one on the bottom left corner is feathering in slowly so I think that one is a roo.

 

[Lacey1988]

It looks different now let me put a recent pic that one was a 4 day ago