Hen or roosters?

[Silly_chicken]

I have four 10 week old chickens and I need help to know the gender as I cant keep the roosters.

They are a mix of Australorp and possibly a barnevelder/dark cornish.
1 I know is a rooster for sure as he has started to make lots of noise.

1.he is my rooster.

2.not sure (rooster is in back)

3.not sure

4.not sure

Here is a picture comparing them together

My gut is that they are all roosters. Any help is appreciated.

Thank you.

 

[The Happster]

You have one pullet.
How on earth did you end up with so many boys?

 

[black_cat]

The rooster fairy was generous this year. I see only one pullet in the bunch.

 

[Silly_chicken]

Which one do you think is the pullet?
And i hatched 8 chicks all together and the other 4 are hens. These 4 just had me stumped.

 

[The Happster]

The grey girl.