Help Needed Sexing 5-6 week old chicks

[43BC]

Can anyone help with Sexing and identifying the type of chicks we have - the pictures are below - I posted them at three weeks and got some replies, they are now 5-6 weeks old? Please help

 

[Rao Adnan]

last one is rooster

 

[Mountain Peeps]

Yes, you have one roo.

 

[Cyan Night]

Honestly they are all a little suspicious to me. But so far your last one is a definite roo