BastyPutt
Yes, your Polish is a cockerel...
Yes Cockerel and a pullet.Ok here are some better pictures…3 of the one I think is a rooster and 1 of the for sure hen.
Sexing chicks at birth is incredibly challenging. Hatcheries will usually say their sexing is 90% accurate. So when you go to those bins and they say female, there is still a chance you'll be getting a male.
A "sexlinked" chicken is one that is bred to hatch different colors for males and females for (usually) 100% sexing accuracy. An "autosexing" breed does this naturally - males will usually have a different appearance than a female. The cuckoo Marans isn't either of those.