1 and 3 looks like roos 1 i am pretty sure is a roo but 3 looks sorta like a roo look on its neck and if the feathers are rounded then its a pullet but if the feathers are pointed its a cockerel ... at the tip of the feather look there
Number 4 is your rooster. It's not pure barred rock, it's a mix of something, I think something straight combed with something non-straight combed, giving it that weird comb. While the comb isn't really big and red (yet), you can see saddle feathers coming in--those longer, drapey feathers that hang down in front of the tail. Those are rooster sign.