Ah yeah I see your predicament. Hopefully they are all boys then and the one just developed earlier. I could definitely be wrong about them looking like girls, with the three having what looks like single combs and smaller crests it is tough for me to really say. I'm mostly going by how much the one looks like a male compared to the others.
Results probably wouldn't be quick with the virus slowing things down but there is always the option of getting them DNA sexed. I think a lot of places cost less than 15 per test.
I hope you are able to figure out what they are without having to go through the hassle of getting them DNA sexed though.