New chicken owner, barred rock question

[Wisconsinted]

Hello all. I bought 3 barred rock pullet chicks from the local farm and fleet who gets their chicks from cackle hatchery. I think I have all pullets based on tons of research but one is a bit different. I was told they are all pullets but I know it's never a sure thing. Two are obvious pullets but one is a little different. Is this one a pullet for sure? The other two are no doubters based on everything I've read. This chicken is 4 to 5 weeks old. I bought them at start or June and imagine they were close to a week old at the time based on what I've seen online. I brought them outside for first time tonight but they're back in brooder inside tonight.

 

[Yardmom]

I think all are pullets.

 

[SilverBirds]

Looks like pullets.