Kathy, thanks for these pictures. I am pleased to see speckled feathers on the heads of your birds, and light-tipped wing feathers. My buckeyes from Ideal (2/3 hatch) have these, and I thought they were all completely untrue to type. I'm feeling a bit better now.
Mine also have thick legs, both hens and roos. I can tell the difference in between hens and roo in most of mine -- the roos have three rows of bumps in the comb, and the hens have only one, or a much less prominent and lighter color comb. The hens also seem to be on average a lighter brown, but again, Ideal buckeyes, not necessarily true to type. Also this morning one of the roos started trying to crow. At 9 weeks! He's not big enough for the pot yet!
If I were to guess I'd say #1 is a hen, #2 is a roo, and #3 in front is definitely a roo. Can't tell in #4.