Genders? Marans/niederrheiner. Breed help appreciated

[Jada22]

Firstly to start off I don’t know for sure what breed these are. Originally I was told one Pekin 3 marans then I was told 1 maran 3 niederrheiners.

When they were younger I posted here and was told 3 was a hen 1,2 and 4 were roosters.
However today 1 was mounted by a rooster who was very upset when I separated them.
Also only one out of the four has been crowing but I’m unsure which one.

They’re around 6 months old.
Sorry for bad pics we have a storm so everyone’s locked in a more sheltered area.

 

[Tookie]

#1 is a Maran cockerel.
#2 and #3 I'm not sure on breeds but they're cockerels.
#3 is a Maran pullet.

 

[Tretinker]

1(Cuckoo Marans), 2 and 4 look like cockerels to me. Only 3 a cuckoo marans pullet.

You might only have one crower because that's the dominant one or they are just late to the party.

As for the Roo mounting them possibly a show of power?

 

[Jada22]

Thanks! The rooster doing the mounting made a clucking sound after I removed the maran and then the maran started making noises back. The maran is quite submissive to the others but the one who mounted him is a more dominant roo