I think #'s 1, 2, and 3 are pullets. Funny, I think they all 3 have fine, thin legs. Their legs look no where near as thick as the EE roo's I gave away. #4 looks like a roo to me, his legs are thicker.
Disclaimer: I'm no expert at all. I'm not even sure of what gender my 12 week old chicks are!!!