Can you get better pictures of the Brahmas? A couple of them looks like potential roos with the dark wing/shoulder patches coming in.
I'm guessing you're calling the brown leghorn the obvious rooster? Besides him, I'm pretty sure at least 2 of those Brahmas are male. Better pics will confirm, as well as age.
X2 I especially notice this on the Brahma next to the fence in photo one. Posting photos of each Brahma's comb would help as well. Males usually have wide, three row pea combs, even at a young age, while the females have smaller, narrower combs.