Any guesses on these 6 1/2 week old Orpingtons?

[CP9000]

I'm suspicious that my Orpington pullets aren't all pullets. One of them is starting to pick on my presumed cockrel but the others are very docile with all the chicks. I've been told that Orpingtons can be difficult to sex so I'm hoping they are pullets.
The little one in the first photo has a larger comb and shorter tail than my other lavender of the same age. 2nd photo for comparison.
The third photo is my more agressive Orpington, also the same age.

 

[Neggative]

the first one i would say is a roo and im not sure on the darker one.....

 

[Mylied]

Pretty sure both are cockerels.

 

[Pretty Birds]

I would guess that they are both cockerels.

 

[jmjordan]

I have both types and the pulleys stay a tan color and very small almost yo the point you cant see the cone. For those I would definitely say cockerels