So hard for most to tell at this stage, Those little feathers fall out and new ones grow in, leaving them looking much different. Best leave this one for the more experienced eyes out there. Good luck!
Although the one on the bottom does look to be getting some red tint to its comb...could be a roo...
Could it be a sexlink? I have 9 different kinds of chicks, most of them I know. Just having a hard time with the buff and sexlink. They were all in a box together so I lost track of who was who. We have had them for 2 weeks and there is a total of 18. They are so cute and most of them come running when I get close to their pen. They love eating treats out of my hand. A few not quiet sure they want anything to do with us. Thank for all your help,