With a lot of zooming in, I see shiny pointed feathers on every buff bird you have pics of. I think you have a bunch of boys since that last pic looks like 5 of em to me 

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How many hens do you have? You need at least 6 hens per rooster. Also, they may seem sweet now, but they can quickly turn mean. Having multiple roosters can lead to fighting, over-mating, and other problems in a flock. I would not advise keeping more than one rooster. Best wishes!I'm considering keeping them regardless. They are docile and quiet and do not harass the other birds. And they add some color to my flock of Austrolorp, Maran and Welsummer hens.