6-8 week old chicks - any roosters in here?

[ChickFB]

Hi i am a first time chicken mom and purposely wanted at least one rooster in my flock. If I do not have one currently I would like to add one to protect them as they will free range soon. That said here are a few pics. I bought one of the very yellow ones as a roo and they are now 6 weeks old. Given the color difference in the beak of the two yellow ones do you think one is a roo (they are the same age). Any other roos spotted in the other pics or pullets otherwise? (The oldest are 8weeks) Thank you!!

 

[Tookie]

Welcome to BYC!

Are the first 4 pictures the same bird? If so, I believe that's probably a male.
Rest are definitely pullets!

 

[ChickFB]

Yes! The first 5 pics are actually the same bird. Thank you.