Two weeks ago I picked up 6 SL Wyandottes at Tractor Supply. The guy there told me that all the featured breeds are pullets and only the the Cornish Rocks are straight run. I noticed that some of the Wyandottes were darker than the others but I didn't think much of it. I checked out and on the receipt it said featured breed st run. Now they are feathering and I am noticing the lighter colored ones are feathering faster. Is it possible that I got some roosters?