The first picture didn't really jump out at me as male when I seen it. It's probably a early laying pullet. Female Leghorns usually have larger combs anyway right?
If you'd like a comparison I have one.
I have two silver duckwing OEGBs, one male one female. Saddle and hackle feathers are the way to sex most breeds.
This is my Batchelor coop. They get along quite nicely.